Polymers functionalized with activated nitrogen heterocycles containing a pendant functional group

ABSTRACT

A method for preparing a functionalized polymer, the method comprising the steps of (i) preparing a halosilane-activated nitrogen heterocycle containing a functional group, (ii) preparing a reactive polymer, and (iii) reacting the reactive polymer with the halosilane-activated nitrogen heterocycle containing a functional group.

This application claims the benefit of U.S. Provisional PatentApplication Ser. No. 62/141,451, filed on Apr. 1, 2015, which isincorporated herein by reference.

FIELD OF THE INVENTION

One or more embodiments of the present invention relate to a method forpreparing a functionalized polymer by reacting a chain-end reactivepolymer with a halosilane-activated, nitrogen heterocycle containing apendant functional group.

BACKGROUND OF THE INVENTION

In the art of manufacturing tires, it is desirable to employ rubbervulcanizates that demonstrate reduced hysteresis, i.e., less loss ofmechanical energy to heat. For example, rubber vulcanizates that showreduced hysteresis are advantageously employed in tire components, suchas sidewalls and treads, to yield tires having desirably low rollingresistance. The hysteresis of a rubber vulcanizate is often attributedto the free polymer chain ends within a crosslinked rubber network, aswell as the dissociation of filler agglomerates.

Functionalized polymers have been employed to reduce the hysteresis ofrubber vulcanizates. The functional group of the functionalized polymermay reduce the number of free polymer chain ends via interaction withfiller particles. Also, the functional group may reduce filleragglomeration. Nevertheless, whether a particular functional groupimparted to a polymer can reduce hysteresis is often unpredictable.

Functionalized polymers may be prepared by post-polymerization treatmentof reactive polymers with certain functionalizing agents. However,whether a reactive polymer can be functionalized by treatment with aparticular functionalizing agent can be unpredictable. For example,functionalizing agents that work for one type of polymer do notnecessarily work for another type of polymer, and vice versa.

Lanthanide-based catalyst systems are known to be useful forpolymerizing conjugated diene monomer to form polydienes having a highcontent of cis-1,4-linkage. The resulting cis-1,4-polydienes may displaypseudo-living characteristics in that, upon completion of thepolymerization, some of the polymer chains possess reactive ends thatcan react with certain functionalizing agents to yield functionalizedcis-1,4-polydienes.

The cis-1,4-polydienes produced with lanthanide-based catalyst systemstypically have a linear backbone, which is believed to provide bettertensile properties, higher abrasion resistance, lower hysteresis, andbetter fatigue resistance as compared to the cis-1,4-polydienes preparedwith other catalyst systems such as titanium-, cobalt-, and nickel-basedcatalyst systems. Therefore, the cis-1,4-polydienes made withlanthanide-based catalysts are particularly suitable for use in tirecomponents such as sidewalls and treads.

Anionic initiators are known to be useful for the polymerization ofconjugated diene monomer to form polydienes having a combination of1,2-, cis-1,4- and trans-1,4-linkages. Anionic initiators are alsouseful for the copolymerization of conjugated diene monomer withvinyl-substituted aromatic compounds. The polymers prepared with anionicinitiators may display living characteristics in that, upon completionof the polymerization, the polymer chains possess living ends that arecapable of reacting with additional monomer for further chain growth orreacting with certain functionalizing agents to give functionalizedpolymers.

Because functionalized polymers are advantageous, especially in themanufacture of tires, there exists a need to develop new functionalizedpolymers that give reduced hysteresis.

SUMMARY OF THE INVENTION

One or more embodiments of the present invention provide a method forpreparing a functionalized polymer, the method comprising the steps of(i) preparing a halosilane-activated nitrogen heterocycle containing afunctional group, (ii) preparing a reactive polymer, and (iii) reactingthe reactive polymer with the halosilane-activated nitrogen heterocyclecontaining a functional group.

Still other embodiments of the present invention provide a method forpreparing a functional polymer, the method comprising the steps of (i)preparing a halosilane-activated nitrogen heterocycle containing apendant functional group by reacting a halosilane with a nitrogenheterocycle containing a functional group, (ii) providing an activepolymerization mixture containing a reactive polymer by polymerizingconjugated diene monomer with an anionic initiator or polymerizingconjugated diene monomer in the presence of a coordination catalystsystem, and (iii) introducing the halosilane-activated nitrogenheterocycle containing a pendant functional group to the activepolymerization mixture without purifying the halosilane-activatednitrogen heterocycle containing a pendant functional group.

Still other embodiments of the present invention provide afunctionalized polymer prepared by the steps of (i) preparing ahalosilane-activated nitrogen heterocycle containing a functional group,(ii) preparing a reactive polymer, and (iii) reacting the reactivepolymer with the halosilane-activated nitrogen heterocycle containing afunctional group.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a graphical plot of hysteresis loss (tan δ) versus Mooneyviscosity (ML 1+4 at 130° C.) for vulcanizates prepared fromfunctionalized cis-1,4-polybutadiene prepared according to one or moreembodiments of the present invention as compared to vulcanizatesprepared from unfunctionalized cis-1,4-polybutadiene.

FIG. 2 is a graphical plot of cold-flow gauge (mm @ 8 min) versuspolymer Mooney viscosity (ML 1+4 at 100° C.) for green polymers preparedfrom functionalized cis-1,4-polybutadiene prepared according to one ormore embodiments of the present invention as compared tounfunctionalized cis-1,4-polybutadiene.

DETAILED DESCRIPTION OF ILLUSTRATIVE EMBODIMENTS

According to one or more embodiments of the present invention, achain-end reactive polymer is prepared by polymerizing conjugated dienemonomer, and optionally monomer copolymerizable therewith, and thechain-end reactive polymer is then reacted with a halosilane-activatednitrogen heterocycle containing a pendant functional group, which may besimply referred to as a halosilane-activated nitrogen heterocycle. Thehalosilane-activated nitrogen heterocycle may be prepared by combining ahalosilane with a nitrogen heterocycle containing a pendant functionalgroup (simply referred to as nitrogen heterocycle) to thereby form theactivated species. The resultant functionalized polymers can be used inthe manufacture of tire components. In one or more embodiments, theresultant functionalized polymers provide tire components that exhibitadvantageously low hysteresis.

Examples of conjugated diene monomer include 1,3-butadiene, isoprene,1,3-pentadiene, 1,3-hexadiene, 2,3-dimethyl-1,3-butadiene,2-ethyl-1,3-butadiene, 2-methyl-1,3-pentadiene, 3-methyl-1,3-pentadiene,4-methyl-1,3-pentadiene, and 2,4-hexadiene. Mixtures of two or moreconjugated dienes may also be utilized in copolymerization.

Examples of monomer copolymerizable with conjugated diene monomerinclude vinyl-substituted aromatic compounds such as styrene,p-methylstyrene, α-methylstyrene, and vinylnaphthalene.

In one or more embodiments, the reactive polymer is prepared bycoordination polymerization, wherein monomer is polymerized by using acoordination catalyst system. The key mechanistic features ofcoordination polymerization have been discussed in books (e.g., Kuran,W., Principles of Coordination Polymerization; John Wiley & Sons: NewYork, 2001) and review articles (e.g., Mulhaupt, R., MacromolecularChemistry and Physics 2003, volume 204, pages 289-327). Coordinationcatalysts are believed to initiate the polymerization of monomer by amechanism that involves the coordination or complexation of monomer toan active metal center prior to the insertion of monomer into a growingpolymer chain. An advantageous feature of coordination catalysts istheir ability to provide stereochemical control of polymerizations andthereby produce stereoregular polymers. As is known in the art, thereare numerous methods for creating coordination catalysts, but allmethods eventually generate an active intermediate that is capable ofcoordinating with monomer and inserting monomer into a covalent bondbetween an active metal center and a growing polymer chain. Thecoordination polymerization of conjugated dienes is believed to proceedvia π-allyl complexes as intermediates. Coordination catalysts can beone-, two-, three- or multi-component systems. In one or moreembodiments, a coordination catalyst may be formed by combining a heavymetal compound (e.g., a transition metal compound or alanthanide-containing compound), an alkylating agent (e.g., anorganoaluminum compound), and optionally other co-catalyst components(e.g., a Lewis acid or a Lewis base). In one or more embodiments, theheavy metal compound may be referred to as a coordinating metalcompound.

Various procedures can be used to prepare coordination catalysts. In oneor more embodiments, a coordination catalyst may be formed in situ byseparately adding the catalyst components to the monomer to bepolymerized in either a stepwise or simultaneous manner. In otherembodiments, a coordination catalyst may be preformed. That is, thecatalyst components are pre-mixed outside the polymerization systemeither in the absence of any monomer or in the presence of a smallamount of monomer. The resulting preformed catalyst composition may beaged, if desired, and then added to the monomer that is to bepolymerized.

Useful coordination catalyst systems include lanthanide-based catalystsystems. These catalyst systems may advantageously producecis-1,4-polydienes that, prior to quenching, have reactive chain endsand may be referred to as pseudo-living polymers. While othercoordination catalyst systems may also be employed, lanthanide-basedcatalysts have been found to be particularly advantageous, andtherefore, without limiting the scope of the present invention, will bediscussed in greater detail.

Practice of the present invention is not necessarily limited by theselection of any particular lanthanide-based catalyst system. In one ormore embodiments, the catalyst systems employed include (a) alanthanide-containing compound, (b) an alkylating agent, and (c) ahalogen source. In other embodiments, a compound containing anon-coordinating anion or a non-coordinating anion precursor can beemployed in lieu of a halogen source. In these or other embodiments,other organometallic compounds, Lewis bases, and/or catalyst modifierscan be employed in addition to the ingredients or components set forthabove. For example, in one embodiment, a nickel-containing compound canbe employed as a molecular weight regulator as disclosed in U.S. Pat.No. 6,699,813, which is incorporated herein by reference.

As mentioned above, the lanthanide-based catalyst systems employed inthe present invention can include a lanthanide-containing compound.Lanthanide-containing compounds useful in the present invention arethose compounds that include at least one atom of lanthanum, neodymium,cerium, praseodymium, promethium, samarium, europium, gadolinium,terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium, anddidymium. In one embodiment, these compounds can include neodymium,lanthanum, samarium, or didymium. As used herein, the term “didymium”shall denote a commercial mixture of rare-earth elements obtained frommonazite sand. In addition, the lanthanide-containing compounds usefulin the present invention can be in the form of elemental lanthanide.

The lanthanide atom in the lanthanide-containing compounds can be invarious oxidation states including, but not limited to, the 0, +2, +3,and +4 oxidation states. In one embodiment, a trivalentlanthanide-containing compound, where the lanthanide atom is in the +3oxidation state, can be employed. Suitable lanthanide-containingcompounds include, but are not limited to, lanthanide carboxylates,lanthanide organophosphates, lanthanide organophosphonates, lanthanideorganophosphinates, lanthanide carbamates, lanthanide dithiocarbamates,lanthanide xanthates, lanthanide β-diketonates, lanthanide alkoxides oraryloxides, lanthanide halides, lanthanide pseudo-halides, lanthanideoxyhalides, and organolanthanide compounds.

In one or more embodiments, the lanthanide-containing compounds can besoluble in hydrocarbon solvents such as aromatic hydrocarbons, aliphatichydrocarbons, or cycloaliphatic hydrocarbons. Hydrocarbon-insolublelanthanide-containing compounds, however, may also be useful in thepresent invention, as they can be suspended in the polymerization mediumto form the catalytically active species.

For ease of illustration, further discussion of usefullanthanide-containing compounds will focus on neodymium compounds,although those skilled in the art will be able to select similarcompounds that are based upon other lanthanide metals.

Suitable neodymium carboxylates include, but are not limited to,neodymium formate, neodymium acetate, neodymium acrylate, neodymiummethacrylate, neodymium valerate, neodymium gluconate, neodymiumcitrate, neodymium fumarate, neodymium lactate, neodymium maleate,neodymium oxalate, neodymium 2-ethylhexanoate, neodymium neodecanoate(a.k.a., neodymium versatate), neodymium naphthenate, neodymiumstearate, neodymium oleate, neodymium benzoate, and neodymiumpicolinate.

Suitable neodymium organophosphates include, but are not limited to,neodymium dibutyl phosphate, neodymium dipentyl phosphate, neodymiumdihexyl phosphate, neodymium diheptyl phosphate, neodymium dioctylphosphate, neodymium bis(1-methylheptyl) phosphate, neodymiumbis(2-ethylhexyl) phosphate, neodymium didecyl phosphate, neodymiumdidodecyl phosphate, neodymium dioctadecyl phosphate, neodymium dioleylphosphate, neodymium diphenyl phosphate, neodymium bis(p-nonylphenyl)phosphate, neodymium butyl (2-ethylhexyl) phosphate, neodymium(1-methylheptyl) (2-ethylhexyl) phosphate, and neodymium (2-ethylhexyl)(p-nonylphenyl) phosphate.

Suitable neodymium organophosphonates include, but are not limited to,neodymium butyl phosphonate, neodymium pentyl phosphonate, neodymiumhexyl phosphonate, neodymium heptyl phosphonate, neodymium octylphosphonate, neodymium (1-methylheptyl) phosphonate, neodymium(2-ethylhexyl) phosphonate, neodymium decyl phosphonate, neodymiumdodecyl phosphonate, neodymium octadecyl phosphonate, neodymium oleylphosphonate, neodymium phenyl phosphonate, neodymium (p-nonylphenyl)phosphonate, neodymium butyl butylphosphonate, neodymium pentylpentylphosphonate, neodymium hexyl hexylphosphonate, neodymium heptylheptylphosphonate, neodymium octyl octylphosphonate, neodymium(1-methylheptyl) (1-methylheptyl)phosphonate, neodymium (2-ethylhexyl)(2-ethylhexyl)phosphonate, neodymium decyl decylphosphonate, neodymiumdodecyl dodecylphosphonate, neodymium octadecyl octadecylphosphonate,neodymium oleyl oleylphosphonate, neodymium phenyl phenylphosphonate,neodymium (p-nonylphenyl) (p-nonylphenyl)phosphonate, neodymium butyl(2-ethylhexyl)phosphonate, neodymium (2-ethylhexyl) butylphosphonate,neodymium (1-methylheptyl) (2-ethylhexyl)phosphonate, neodymium(2-ethylhexyl) (1-methylheptyl)phosphonate, neodymium (2-ethylhexyl)(p-nonylphenyl)phosphonate, and neodymium (p-nonylphenyl)(2-ethylhexyl)phosphonate.

Suitable neodymium organophosphinates include, but are not limited to,neodymium butylphosphinate, neodymium pentylphosphinate, neodymiumhexylphosphinate, neodymium heptylphosphinate, neodymiumoctylphosphinate, neodymium (1-methylheptyl)phosphinate, neodymium(2-ethylhexyl)phosphinate, neodymium decylphosphinate, neodymiumdodecylphosphinate, neodymium octadecylphosphinate, neodymiumoleylphosphinate, neodymium phenylphosphinate, neodymium(p-nonylphenyl)phosphinate, neodymium dibutylphosphinate, neodymiumdipentylphosphinate, neodymium dihexylphosphinate, neodymiumdiheptylphosphinate, neodymium dioctylphosphinate, neodymiumbis(1-methylheptyl)phosphinate, neodymium bis(2-ethylhexyl)phosphinate,neodymium didecylphosphinate, neodymium didodecylphosphinate, neodymiumdioctadecylphosphinate, neodymium dioleylphosphinate, neodymiumdiphenylphosphinate, neodymium bis(p-nonylphenyl) phosphinate, neodymiumbutyl (2-ethylhexyl) phosphinate, neodymium(1-methylheptyl)(2-ethylhexyl)phosphinate, and neodymium(2-ethylhexyl)(p-nonylphenyl) phosphinate.

Suitable neodymium carbamates include, but are not limited to, neodymiumdimethylcarbamate, neodymium diethylcarbamate, neodymiumdiisopropylcarbamate, neodymium dibutylcarbamate, and neodymiumdibenzylcarbamate.

Suitable neodymium dithiocarbamates include, but are not limited to,neodymium dimethyldithiocarbamate, neodymium diethyldithiocarbamate,neodymium diisopropyldithiocarbamate, neodymium dibutyldithiocarbamate,and neodymium dibenzyldithiocarbamate.

Suitable neodymium xanthates include, but are not limited to, neodymiummethylxanthate, neodymium ethylxanthate, neodymium isopropylxanthate,neodymium butylxanthate, and neodymium benzylxanthate.

Suitable neodymium β-diketonates include, but are not limited to,neodymium acetylacetonate, neodymium trifluoroacetylacetonate, neodymiumhexafluoroacetylacetonate, neodymium benzoylacetonate, and neodymium2,2,6,6-tetramethyl-3,5-heptanedionate.

Suitable neodymium alkoxides or aryloxides include, but are not limitedto, neodymium methoxide, neodymium ethoxide, neodymium isopropoxide,neodymium 2-ethylhexoxide, neodymium phenoxide, neodymiumnonylphenoxide, and neodymium naphthoxide.

Suitable neodymium halides include, but are not limited to, neodymiumfluoride, neodymium chloride, neodymium bromide, and neodymium iodide.Suitable neodymium pseudo-halides include, but are not limited to,neodymium cyanide, neodymium cyanate, neodymium thiocyanate, neodymiumazide, and neodymium ferrocyanide. Suitable neodymium oxyhalidesinclude, but are not limited to, neodymium oxyfluoride, neodymiumoxychloride, and neodymium oxybromide. A Lewis base, such astetrahydrofuran (“THF”), may be employed as an aid for solubilizing thisclass of neodymium compounds in inert organic solvents. Where lanthanidehalides, lanthanide oxyhalides, or other lanthanide-containing compoundscontaining a halogen atom are employed, the lanthanide-containingcompound may optionally also provide all or part of the halogen sourcein the lanthanide-based catalyst system.

As used herein, the term organolanthanide compound refers to anylanthanide-containing compound containing at least one lanthanide-carbonbond. These compounds are predominantly, though not exclusively, thosecontaining cyclopentadienyl (“Cp”), substituted cyclopentadienyl, allyl,and substituted allyl ligands. Suitable organolanthanide compoundsinclude, but are not limited to, Cp₃Ln, Cp₂LnR, Cp₂LnCl, CpLnCl₂,CpLn(cyclooctatetraene), (C₅Me₅)₂LnR, LnR₃, Ln(allyl)₃, andLn(allyl)₂Cl, where Ln represents a lanthanide atom, and R represents ahydrocarbyl group. In one or more embodiments, hydrocarbyl groups usefulin the present invention may contain heteroatoms such as, for example,nitrogen, oxygen, boron, silicon, sulfur, and phosphorus atoms.

As mentioned above, the lanthanide-based catalyst systems employed inthe present invention can include an alkylating agent. In one or moreembodiments, alkylating agents, which may also be referred to ashydrocarbylating agents, include organometallic compounds that cantransfer one or more hydrocarbyl groups to another metal. Generally,these agents include organometallic compounds of electropositive metalssuch as Groups 1, 2, and 3 metals (Groups IA, IIA, and IIIA metals).Alkylating agents useful in the present invention include, but are notlimited to, organoaluminum and organomagnesium compounds. As usedherein, the term organoaluminum compound refers to any aluminum compoundcontaining at least one aluminum-carbon bond. In one or moreembodiments, organoaluminum compounds that are soluble in a hydrocarbonsolvent can be employed. As used herein, the term organomagnesiumcompound refers to any magnesium compound that contains at least onemagnesium-carbon bond. In one or more embodiments, organomagnesiumcompounds that are soluble in a hydrocarbon can be employed. As will bedescribed in more detail below, several species of suitable alkylatingagents can be in the form of a halide. Where the alkylating agentincludes a halogen atom, the alkylating agent may also serve as all orpart of the halogen source in the above-mentioned catalyst system.

In one or more embodiments, organoaluminum compounds that can beutilized in the lanthanide-based catalyst system include thoserepresented by the general formula AlR_(n)X_(3-n), where each Rindependently can be a monovalent organic group that is attached to thealuminum atom via a carbon atom, where each X independently can be ahydrogen atom, a halogen atom, a carboxylate group, an alkoxide group,or an aryloxide group, and where n can be an integer in the range offrom 1 to 3. In one or more embodiments, each R independently can be ahydrocarbyl group such as, for example, alkyl, cycloalkyl, substitutedcycloalkyl, alkenyl, cycloalkenyl, substituted cycloalkenyl, aryl,substituted aryl, aralkyl, alkaryl, allyl, and alkynyl groups, with eachgroup containing in the range of from 1 carbon atom, or the appropriateminimum number of carbon atoms to form the group, up to about 20 carbonatoms. These hydrocarbyl groups may contain heteroatoms including, butnot limited to, nitrogen, oxygen, boron, silicon, sulfur, and phosphorusatoms.

Types of the organoaluminum compounds that are represented by thegeneral formula AlR_(n)X_(3-n) include, but are not limited to,trihydrocarbylaluminum, dihydrocarbylaluminum hydride,hydrocarbylaluminum dihydride, dihydrocarbylaluminum carboxylate,hydrocarbylaluminum bis(carboxylate), dihydrocarbylaluminum alkoxide,hydrocarbylaluminum dialkoxide, dihydrocarbylaluminum halide,hydrocarbylaluminum dihalide, dihydrocarbylaluminum aryloxide, andhydrocarbylaluminum diaryloxide compounds. In one embodiment, thealkylating agent can comprise trihydrocarbylaluminum,dihydrocarbylaluminum hydride, and/or hydrocarbylaluminum dihydridecompounds. In one embodiment, when the alkylating agent includes anorganoaluminum hydride compound, the above-mentioned halogen source canbe provided by a tin halide, as disclosed in U.S. Pat. No. 7,008,899,which is incorporated herein by reference in its entirety.

Suitable trihydrocarbylaluminum compounds include, but are not limitedto, trimethylaluminum, triethylaluminum, triisobutylaluminum,tri-n-propylaluminum, triisopropylaluminum, tri-n-butylaluminum,tri-t-butylaluminum, tri-n-pentylaluminum, trineopentylaluminum,tri-n-hexylaluminum, tri-n-octylaluminum, tris(2-ethylhexyl)aluminum,tricyclohexylaluminum, tris(1-methylcyclopentyl)aluminum,triphenylaluminum, tri-p-tolylaluminum,tris(2,6-dimethylphenyl)aluminum, tribenzylaluminum,diethylphenylaluminum, diethyl-p-tolylaluminum, diethylbenzylaluminum,ethyldiphenylaluminum, ethyldi-p-tolylaluminum, andethyldibenzylaluminum.

Suitable dihydrocarbylaluminum hydride compounds include, but are notlimited to, diethylaluminum hydride, di-n-propylaluminum hydride,diisopropylaluminum hydride, di-n-butylaluminum hydride,diisobutylaluminum hydride, di-n-octylaluminum hydride, diphenylaluminumhydride, di-p-tolylaluminum hydride, dibenzylaluminum hydride,phenylethylaluminum hydride, phenyl-n-propylaluminum hydride,phenylisopropylaluminum hydride, phenyl-n-butylaluminum hydride,phenylisobutylaluminum hydride, phenyl-n-octylaluminum hydride,p-tolylethylaluminum hydride, p-tolyl-n-propylaluminum hydride,p-tolylisopropylaluminum hydride, p-tolyl-n-butylaluminum hydride,p-tolylisobutylaluminum hydride, p-tolyl-n-octylaluminum hydride,benzylethylaluminum hydride, benzyl-n-propylaluminum hydride,benzylisopropylaluminum hydride, benzyl-n-butylaluminum hydride,benzylisobutylaluminum hydride, and benzyl-n-octylaluminum hydride.

Suitable hydrocarbylaluminum dihydrides include, but are not limited to,ethylaluminum dihydride, n-propylaluminum dihydride, isopropylaluminumdihydride, n-butylaluminum dihydride, isobutylaluminum dihydride, andn-octylaluminum dihydride.

Suitable dihydrocarbylaluminum halide compounds include, but are notlimited to, diethylaluminum chloride, di-n-propylaluminum chloride,diisopropylaluminum chloride, di-n-butylaluminum chloride,diisobutylaluminum chloride, di-n-octylaluminum chloride,diphenylaluminum chloride, di-p-tolylaluminum chloride, dibenzylaluminumchloride, phenylethylaluminum chloride, phenyl-n-propylaluminumchloride, phenylisopropylaluminum chloride, phenyl-n-butylaluminumchloride, phenylisobutylaluminum chloride, phenyl-n-octylaluminumchloride, p-tolylethylaluminum chloride, p-tolyl-n-propylaluminumchloride, p-tolylisopropylaluminum chloride, p-tolyl-n-butylaluminumchloride, p-tolylisobutylaluminum chloride, p-tolyl-n-octylaluminumchloride, benzylethylaluminum chloride, benzyl-n-propylaluminumchloride, benzylisopropylaluminum chloride, benzyl-n-butylaluminumchloride, benzylisobutylaluminum chloride, and benzyl-n-octylaluminumchloride.

Suitable hydrocarbylaluminum dihalide compounds include, but are notlimited to, ethylaluminum dichloride, n-propylaluminum dichloride,isopropylaluminum dichloride, n-butylaluminum dichloride,isobutylaluminum dichloride, and n-octylaluminum dichloride.

Other organoaluminum compounds useful as alkylating agents that may berepresented by the general formula AlR_(n)X_(3-n) include, but are notlimited to, dimethylaluminum hexanoate, diethylaluminum octoate,diisobutylaluminum 2-ethylhexanoate, dimethylaluminum neodecanoate,diethylaluminum stearate, diisobutylaluminum oleate, methylaluminumbis(hexanoate), ethylaluminum bis(octoate), isobutylaluminumbis(2-ethylhexanoate), methylaluminum bis(neodecanoate), ethylaluminumbis(stearate), isobutylaluminum bis(oleate), dimethylaluminum methoxide,diethylaluminum methoxide, diisobutylaluminum methoxide,dimethylaluminum ethoxide, diethylaluminum ethoxide, diisobutylaluminumethoxide, dimethylaluminum phenoxide, diethylaluminum phenoxide,diisobutylaluminum phenoxide, methylaluminum dimethoxide, ethylaluminumdimethoxide, isobutylaluminum dimethoxide, methylaluminum diethoxide,ethylaluminum diethoxide, isobutylaluminum diethoxide, methylaluminumdiphenoxide, ethylaluminum diphenoxide, and isobutylaluminumdiphenoxide.

Another class of organoaluminum compounds suitable for use as analkylating agent in the lanthanide-based catalyst system isaluminoxanes. Aluminoxanes can comprise oligomeric linear aluminoxanes,which can be represented by the general formula:

and oligomeric cyclic aluminoxanes, which can be represented by thegeneral formula:

where x can be an integer in the range of from 1 to about 100, or about10 to about 50; y can be an integer in the range of from 2 to about 100,or about 3 to about 20; and where each R independently can be amonovalent organic group that is attached to the aluminum atom via acarbon atom. In one embodiment, each R independently can be ahydrocarbyl group including, but not limited to, alkyl, cycloalkyl,substituted cycloalkyl, alkenyl, cycloalkenyl, substituted cycloalkenyl,aryl, substituted aryl, aralkyl, alkaryl, allyl, and alkynyl groups,with each group containing in the range of from 1 carbon atom, or theappropriate minimum number of carbon atoms to form the group, up toabout 20 carbon atoms. These hydrocarbyl groups may also containheteroatoms including, but not limited to, nitrogen, oxygen, boron,silicon, sulfur, and phosphorus atoms. It should be noted that thenumber of moles of the aluminoxane as used in this application refers tothe number of moles of the aluminum atoms rather than the number ofmoles of the oligomeric aluminoxane molecules. This convention iscommonly employed in the art of catalyst systems utilizing aluminoxanes.

Aluminoxanes can be prepared by reacting trihydrocarbylaluminumcompounds with water. This reaction can be performed according to knownmethods, such as, for example, (1) a method in which thetrihydrocarbylaluminum compound is dissolved in an organic solvent andthen contacted with water, (2) a method in which thetrihydrocarbylaluminum compound is reacted with water of crystallizationcontained in, for example, metal salts, or water adsorbed in inorganicor organic compounds, or (3) a method in which thetrihydrocarbylaluminum compound is reacted with water in the presence ofthe monomer or monomer solution that is to be polymerized.

Suitable aluminoxane compounds include, but are not limited to,methylaluminoxane (“MAO”), modified methylaluminoxane (“MMAO”),ethylaluminoxane, n-propylaluminoxane, isopropylaluminoxane,butylaluminoxane, isobutylaluminoxane, n-pentylaluminoxane,neopentylaluminoxane, n-hexylaluminoxane, n-octylaluminoxane,2-ethylhexylaluminoxane, cyclohexylaluminoxane,1-methylcyclopentylaluminoxane, phenylaluminoxane, and2,6-dimethylphenylaluminoxane. Modified methylaluminoxane can be formedby substituting about 20 to 80 percent of the methyl groups ofmethylaluminoxane with C₂ to C₁₂ hydrocarbyl groups, preferably withisobutyl groups, by using techniques known to those skilled in the art.

In one or more embodiments, aluminoxanes can be used alone or incombination with other organoaluminum compounds. In one embodiment,methylaluminoxane and at least one other organoaluminum compound (e.g.,AlR_(n)X_(3-n)), such as diisobutyl aluminum hydride, can be employed incombination. U.S. Publication No. 2008/0182954, which is incorporatedherein by reference in its entirety, provides other examples wherealuminoxanes and organoaluminum compounds can be employed incombination.

As mentioned above, alkylating agents useful in the lanthanide-basedcatalyst system can include organomagnesium compounds. In one or moreembodiments, organomagnesium compounds that can be utilized includethose represented by the general formula MgR₂, where each Rindependently can be a monovalent organic group that is attached to themagnesium atom via a carbon atom. In one or more embodiments, each Rindependently can be a hydrocarbyl group including, but not limited to,alkyl, cycloalkyl, substituted cycloalkyl, alkenyl, cycloalkenyl,substituted cycloalkenyl, aryl, allyl, substituted aryl, aralkyl,alkaryl, and alkynyl groups, with each group containing in the range offrom 1 carbon atom, or the appropriate minimum number of carbon atoms toform the group, up to about 20 carbon atoms. These hydrocarbyl groupsmay also contain heteroatoms including, but not limited to, nitrogen,oxygen, silicon, sulfur, and phosphorus atoms.

Suitable organomagnesium compounds that may be represented by thegeneral formula MgR₂ include, but are not limited to, diethylmagnesium,di-n-propylmagnesium, diisopropylmagnesium, dibutylmagnesium,dihexylmagnesium, diphenylmagnesium, and dibenzylmagnesium.

Another class of organomagnesium compounds that can be utilized as analkylating agent may be represented by the general formula RMgX, where Rcan be a monovalent organic group that is attached to the magnesium atomvia a carbon atom, and X can be a hydrogen atom, a halogen atom, acarboxylate group, an alkoxide group, or an aryloxide group. Where thealkylating agent is an organomagnesium compound that includes a halogenatom, the organomagnesium compound can serve as both the alkylatingagent and at least a portion of the halogen source in the catalystsystems. In one or more embodiments, R can be a hydrocarbyl groupincluding, but not limited to, alkyl, cycloalkyl, substitutedcycloalkyl, alkenyl, cycloalkenyl, substituted cycloalkenyl, aryl,allyl, substituted aryl, aralkyl, alkaryl, and alkynyl groups, with eachgroup containing in the range of from 1 carbon atom, or the appropriateminimum number of carbon atoms to form the group, up to about 20 carbonatoms. These hydrocarbyl groups may also contain heteroatoms including,but not limited to, nitrogen, oxygen, boron, silicon, sulfur, andphosphorus atoms. In one embodiment, X can be a carboxylate group, analkoxide group, or an aryloxide group, with each group containing in therange of from 1 to about 20 carbon atoms.

Types of organomagnesium compounds that may be represented by thegeneral formula RMgX include, but are not limited to,hydrocarbylmagnesium hydride, hydrocarbylmagnesium halide,hydrocarbylmagnesium carboxylate, hydrocarbylmagnesium alkoxide, andhydrocarbylmagnesium aryloxide.

Suitable organomagnesium compounds that may be represented by thegeneral formula RMgX include, but are not limited to, methylmagnesiumhydride, ethylmagnesium hydride, butylmagnesium hydride, hexylmagnesiumhydride, phenylmagnesium hydride, benzylmagnesium hydride,methylmagnesium chloride, ethylmagnesium chloride, butylmagnesiumchloride, hexylmagnesium chloride, phenylmagnesium chloride,benzylmagnesium chloride, methylmagnesium bromide, ethylmagnesiumbromide, butylmagnesium bromide, hexylmagnesium bromide, phenylmagnesiumbromide, benzylmagnesium bromide, methylmagnesium hexanoate,ethylmagnesium hexanoate, butylmagnesium hexanoate, hexylmagnesiumhexanoate, phenylmagnesium hexanoate, benzylmagnesium hexanoate,methylmagnesium ethoxide, ethylmagnesium ethoxide, butylmagnesiumethoxide, hexylmagnesium ethoxide, phenylmagnesium ethoxide,benzylmagnesium ethoxide, methylmagnesium phenoxide, ethylmagnesiumphenoxide, butylmagnesium phenoxide, hexylmagnesium phenoxide,phenylmagnesium phenoxide, and benzylmagnesium phenoxide.

As mentioned above, the lanthanide-based catalyst systems employed inthe present invention can include a halogen source. As used herein, theterm halogen source refers to any substance including at least onehalogen atom. In one or more embodiments, at least a portion of thehalogen source can be provided by either of the above-describedlanthanide-containing compound and/or the above-described alkylatingagent, when those compounds contain at least one halogen atom. In otherwords, the lanthanide-containing compound can serve as both thelanthanide-containing compound and at least a portion of the halogensource. Similarly, the alkylating agent can serve as both the alkylatingagent and at least a portion of the halogen source.

In another embodiment, at least a portion of the halogen source can bepresent in the catalyst systems in the form of a separate and distincthalogen-containing compound. Various compounds, or mixtures thereof,that contain one or more halogen atoms can be employed as the halogensource. Examples of halogen atoms include, but are not limited to,fluorine, chlorine, bromine, and iodine. A combination of two or morehalogen atoms can also be utilized. Halogen-containing compounds thatare soluble in a hydrocarbon solvent are suitable for use in the presentinvention. Hydrocarbon-insoluble halogen-containing compounds, however,can be suspended in a polymerization system to form the catalyticallyactive species, and are therefore also useful.

Useful types of halogen-containing compounds that can be employedinclude, but are not limited to, elemental halogens, mixed halogens,hydrogen halides, organic halides, inorganic halides, metallic halides,and organometallic halides.

Suitable elemental halogens include, but are not limited to, fluorine,chlorine, bromine, and iodine. Some specific examples of suitable mixedhalogens include iodine monochloride, iodine monobromide, iodinetrichloride, and iodine pentafluoride.

Suitable hydrogen halides include, but are not limited to, hydrogenfluoride, hydrogen chloride, hydrogen bromide, and hydrogen iodide.

Suitable organic halides include, but are not limited to, t-butylchloride, t-butyl bromide, allyl chloride, allyl bromide, benzylchloride, benzyl bromide, chloro-di-phenylmethane,bromo-di-phenylmethane, triphenylmethyl chloride, triphenylmethylbromide, benzylidene chloride, benzylidene bromide,methyltrichlorosilane, phenyltrichlorosilane, dimethyldichlorosilane,diphenyldichlorosilane, trimethylchlorosilane, benzoyl chloride, benzoylbromide, propionyl chloride, propionyl bromide, methyl chloroformate,and methyl bromoformate.

Suitable inorganic halides include, but are not limited to, phosphorustrichloride, phosphorus tribromide, phosphorus pentachloride, phosphorusoxychloride, phosphorus oxybromide, boron trifluoride, borontrichloride, boron tribromide, silicon tetrafluoride, silicontetrachloride, silicon tetrabromide, silicon tetraiodide, arsenictrichloride, arsenic tribromide, arsenic triiodide, seleniumtetrachloride, selenium tetrabromide, tellurium tetrachloride, telluriumtetrabromide, and tellurium tetraiodide.

Suitable metallic halides include, but are not limited to, tintetrachloride, tin tetrabromide, aluminum trichloride, aluminumtribromide, antimony trichloride, antimony pentachloride, antimonytribromide, aluminum triiodide, aluminum trifluoride, galliumtrichloride, gallium tribromide, gallium triiodide, gallium trifluoride,indium trichloride, indium tribromide, indium triiodide, indiumtrifluoride, titanium tetrachloride, titanium tetrabromide, titaniumtetraiodide, zinc dichloride, zinc dibromide, zinc diiodide, and zincdifluoride.

Suitable organometallic halides include, but are not limited to,dimethylaluminum chloride, diethylaluminum chloride, dimethylaluminumbromide, diethylaluminum bromide, dimethylaluminum fluoride,diethylaluminum fluoride, methylaluminum dichloride, ethylaluminumdichloride, methylaluminum dibromide, ethylaluminum dibromide,methylaluminum difluoride, ethylaluminum difluoride, methylaluminumsesquichloride, ethylaluminum sesquichloride, isobutylaluminumsesquichloride, methylmagnesium chloride, methylmagnesium bromide,methylmagnesium iodide, ethylmagnesium chloride, ethylmagnesium bromide,butylmagnesium chloride, butylmagnesium bromide, phenylmagnesiumchloride, phenylmagnesium bromide, benzylmagnesium chloride,trimethyltin chloride, trimethyltin bromide, triethyltin chloride,triethyltin bromide, di-t-butyltin dichloride, di-t-butyltin dibromide,dibutyltin dichloride, dibutyltin dibromide, tributyltin chloride, andtributyltin bromide.

In one or more embodiments, the lanthanide-based catalyst systems cancomprise a compound containing a non-coordinating anion or anon-coordinating anion precursor. In one or more embodiments, a compoundcontaining a non-coordinating anion, or a non-coordinating anionprecursor can be employed in lieu of the above-described halogen source.A non-coordinating anion is a sterically bulky anion that does not formcoordinate bonds with, for example, the active center of a catalystsystem due to stearic hindrance. Non-coordinating anions useful in thepresent invention include, but are not limited to, tetraarylborateanions and fluorinated tetraarylborate anions. Compounds containing anon-coordinating anion can also contain a counter cation, such as acarbonium, ammonium, or phosphonium cation. Exemplary counter cationsinclude, but are not limited to, triarylcarbonium cations andN,N-dialkylanilinium cations. Examples of compounds containing anon-coordinating anion and a counter cation include, but are not limitedto, triphenylcarbonium tetrakis(pentafluorophenyl)borate,N,N-dimethylanilinium tetrakis(pentafluorophenyl)borate,triphenylcarbonium tetrakis [3,5-bis(trifluoromethyl)phenyl]borate, andN,N-dimethylanilinium tetrakis [3,5-bis(trifluoromethyl)phenyl]borate.

A non-coordinating anion precursor can also be used in this embodiment.A non-coordinating anion precursor is a compound that is able to form anon-coordinating anion under reaction conditions. Usefulnon-coordinating anion precursors include, but are not limited to,triarylboron compounds, BR₃, where R is a strong electron-withdrawingaryl group, such as a pentafluorophenyl or3,5-bis(trifluoromethyl)phenyl group.

The lanthanide-based catalyst composition used in this invention may beformed by combining or mixing the foregoing catalyst ingredients.Although one or more active catalyst species are believed to result fromthe combination of the lanthanide-based catalyst ingredients, the degreeof interaction or reaction between the various catalyst ingredients orcomponents is not known with any great degree of certainty. Therefore,the term “catalyst composition” has been employed to encompass a simplemixture of the ingredients, a complex of the various ingredients that iscaused by physical or chemical forces of attraction, a chemical reactionproduct of the ingredients, or a combination of the foregoing.

The foregoing lanthanide-based catalyst composition may have highcatalytic activity for polymerizing conjugated dienes intocis-1,4-polydienes over a wide range of catalyst concentrations andcatalyst ingredient ratios. Several factors may impact the optimumconcentration of any one of the catalyst ingredients. For example,because the catalyst ingredients may interact to form an active species,the optimum concentration for any one catalyst ingredient may bedependent upon the concentrations of the other catalyst ingredients.

In one or more embodiments, the molar ratio of the alkylating agent tothe lanthanide-containing compound (alkylating agent/Ln) can be variedfrom about 1:1 to about 1,000:1, in other embodiments from about 2:1 toabout 500:1, and in other embodiments from about 5:1 to about 200:1.

In those embodiments where both an aluminoxane and at least one otherorganoaluminum agent are employed as alkylating agents, the molar ratioof the aluminoxane to the lanthanide-containing compound(aluminoxane/Ln) can be varied from 5:1 to about 1,000:1, in otherembodiments from about 10:1 to about 700:1, and in other embodimentsfrom about 20:1 to about 500:1; and the molar ratio of the at least oneother organoaluminum compound to the lanthanide-containing compound(Al/Ln) can be varied from about 1:1 to about 200:1, in otherembodiments from about 2:1 to about 150:1, and in other embodiments fromabout 5:1 to about 100:1.

The molar ratio of the halogen-containing compound to thelanthanide-containing compound is best described in terms of the ratioof the moles of halogen atoms in the halogen source to the moles oflanthanide atoms in the lanthanide-containing compound (halogen/Ln). Inone or more embodiments, the halogen/Ln molar ratio can be varied fromabout 0.5:1 to about 20:1, in other embodiments from about 1:1 to about10:1, and in other embodiments from about 2:1 to about 6:1.

In yet another embodiment, the molar ratio of the non-coordinating anionor non-coordinating anion precursor to the lanthanide-containingcompound (An/Ln) may be from about 0.5:1 to about 20:1, in otherembodiments from about 0.75:1 to about 10:1, and in other embodimentsfrom about 1:1 to about 6:1.

The lanthanide-based catalyst composition can be formed by variousmethods.

In one embodiment, the lanthanide-based catalyst composition may beformed in situ by adding the catalyst ingredients to a solutioncontaining monomer and solvent, or to bulk monomer, in either a stepwiseor simultaneous manner. In one embodiment, the alkylating agent can beadded first, followed by the lanthanide-containing compound, and thenfollowed by the halogen source or by the compound containing anon-coordinating anion or the non-coordinating anion precursor.

In another embodiment, the lanthanide-based catalyst composition may bepreformed. That is, the catalyst ingredients are pre-mixed outside thepolymerization system either in the absence of any monomer or in thepresence of a small amount of at least one conjugated diene monomer atan appropriate temperature, which may be from about −20° C. to about 80°C. The amount of conjugated diene monomer that may be used forpreforming the catalyst can range from about 1 to about 500 moles, inother embodiments from about 5 to about 250 moles, and in otherembodiments from about 10 to about 100 moles per mole of thelanthanide-containing compound. The resulting catalyst composition maybe aged, if desired, prior to being added to the monomer that is to bepolymerized.

In yet another embodiment, the lanthanide-based catalyst composition maybe formed by using a two-stage procedure. The first stage may involvecombining the alkylating agent with the lanthanide-containing compoundeither in the absence of any monomer or in the presence of a smallamount of at least one conjugated diene monomer at an appropriatetemperature, which may be from about −20° C. to about 80° C. The amountof monomer employed in the first stage may be similar to that set forthabove for preforming the catalyst. In the second stage, the mixtureformed in the first stage and the halogen source, non-coordinatinganion, or non-coordinating anion precursor can be charged in either astepwise or simultaneous manner to the monomer that is to bepolymerized.

In one or more embodiments, the reactive polymer is prepared by anionicpolymerization, wherein monomer is polymerized by using an anionicinitiator. The key mechanistic features of anionic polymerization havebeen described in books (e.g., Hsieh, H. L.; Quirk, R. P. AnionicPolymerization: Principles and Practical Applications; Marcel Dekker:New York, 1996) and review articles (e.g., Hadjichristidis, N.;Pitsikalis, M.; Pispas, S.; Iatrou, H.; Chem. Rev. 2001, 101(12),3747-3792). Anionic initiators may advantageously produce livingpolymers that, prior to quenching, are capable of reacting withadditional monomer for further chain growth or reacting with certainfunctionalizing agents to give functionalized polymers.

The practice of this invention is not limited by the selection of anyparticular anionic initiators. In one or more embodiments, the anionicinitiator employed is a functional initiator that imparts a functionalgroup at the head of the polymer chain (i.e., the location from whichthe polymer chain is started). In particular embodiments, the functionalgroup includes one or more heteroatoms (e.g., nitrogen, oxygen, boron,silicon, sulfur, tin, and phosphorus atoms) or heterocyclic groups. Incertain embodiments, the functional group reduces the 50° C. hysteresisloss of carbon-black filled vulcanizates prepared from polymerscontaining the functional group as compared to similar carbon-blackfilled vulcanizates prepared from polymer that does not include thefunctional group.

Exemplary anionic initiators include organolithium compounds. In one ormore embodiments, organolithium compounds may include heteroatoms. Inthese or other embodiments, organolithium compounds may include one ormore heterocyclic groups.

Types of organolithium compounds include alkyllithium, aryllithiumcompounds, and cycloalkyllithium compounds. Specific examples oforganolithium compounds include ethyllithium, n-propyllithium,isopropyllithium, n-butyllithium, sec-butyllithium, t-butyllithium,n-amyllithium, isoamyllithium, and phenyllithium.

Other anionic initiators include alkylmagnesium halide compounds such asbutylmagnesium bromide and phenylmagnesium bromide. Still other anionicinitiators include organosodium compounds such as phenylsodium and2,4,6-trimethylphenylsodium. Also contemplated are those anionicinitiators that give rise to di-living polymers, wherein both ends of apolymer chain are living. Examples of such initiators include dilithioinitiators such as those prepared by reacting 1,3-diisopropenylbenzenewith sec-butyllithium. These and related difunctional initiators aredisclosed in U.S. Pat. No. 3,652,516, which is incorporated herein byreference. Radical anionic initiators may also be employed, includingthose described in U.S. Pat. No. 5,552,483, which is incorporated hereinby reference.

In particular embodiments, the organolithium compounds include a cyclicamine-containing compound such as lithiohexamethyleneimine. These andrelated useful initiators are disclosed in the U.S. Pat. Nos. 5,332,810,5,329,005, 5,578,542, 5,393,721, 5,698,646, 5,491,230, 5,521,309,5,496,940, 5,574,109, and 5,786,441, which are incorporated herein byreference. In other embodiments, the organolithium compounds includelithiated alkylthioacetals such as 2-lithio-2-methyl-1,3-dithiane. Theseand related useful initiators are disclosed in U.S. Publ. Nos.2006/0030657, 2006/0264590, and 2006/0264589, which are incorporatedherein by reference. In still other embodiments, the organolithiumcompounds include alkoxysilyl-containing initiators, such as lithiatedt-butyldimethylpropoxysilane. These and related useful initiators aredisclosed in U.S. Publ. No. 2006/0241241, which is incorporated hereinby reference.

In one or more embodiments, the anionic initiator employed istrialkyltinlithium compound such as tri-n-butyltinlithium. These andrelated useful initiators are disclosed in U.S. Pat. Nos. 3,426,006 and5,268,439, which are incorporated herein by reference.

When elastomeric copolymers containing conjugated diene monomer andvinyl-substituted aromatic monomer are prepared by anionicpolymerization, the conjugated diene monomer and vinyl-substitutedaromatic monomer may be used at a weight ratio of 95:5 to 50:50, or inother embodiments, 90:10 to 65:35. In order to promote the randomizationof comonomers in copolymerization and to control the microstructure(such as 1,2-linkage of conjugated diene monomer) of the polymer, arandomizer, which is typically a polar coordinator, may be employedalong with the anionic initiator.

Compounds useful as randomizers include those having an oxygen ornitrogen heteroatom and a non-bonded pair of electrons. Exemplary typesof randomizers include linear and cyclic oligomeric oxolanyl alkanes;dialkyl ethers of mono and oligo alkylene glycols (also known as glymeethers); crown ethers; tertiary amines; linear THF oligomers; alkalimetal alkoxides; and alkali metal sulfonates. Linear and cyclicoligomeric oxolanyl alkanes are described in U.S. Pat. No. 4,429,091,which is incorporated herein by reference. Specific examples ofrandomizers include 2,2-bis(2′-tetrahydrofuryl)propane,1,2-dimethoxyethane, N,N,N′,N′-tetramethylethylenediamine (TMEDA),tetrahydrofuran (THF), 1,2-dipiperidylethane, dipiperidylmethane,hexamethylphosphoramide, N,N′-dimethylpiperazine, diazabicyclooctane,dimethyl ether, diethyl ether, tri-n-butylamine, potassium t-amylate,potassium 4-dodecylsulfonate, and mixtures thereof.

The amount of randomizer to be employed may depend on various factorssuch as the desired microstructure of the polymer, the ratio of monomerto comonomer, the polymerization temperature, as well as the nature ofthe specific randomizer employed. In one or more embodiments, the amountof randomizer employed may range between 0.05 and 100 moles per mole ofthe anionic initiator.

The anionic initiator and the randomizer can be introduced to thepolymerization system by various methods. In one or more embodiments,the anionic initiator and the randomizer may be added separately to themonomer to be polymerized in either a stepwise or simultaneous manner.In other embodiments, the anionic initiator and the randomizer may bepre-mixed outside the polymerization system either in the absence of anymonomer or in the presence of a small amount of monomer, and theresulting mixture may be aged, if desired, and then added to the monomerthat is to be polymerized.

In one or more embodiments, regardless of whether a coordinationcatalyst or an anionic initiator is used to prepare the reactivepolymer, a solvent may be employed as a carrier to either dissolve orsuspend the catalyst or initiator in order to facilitate the delivery ofthe catalyst or initiator to the polymerization system. In otherembodiments, monomer can be used as the carrier. In yet otherembodiments, the catalyst or initiator can be used in their neat statewithout any solvent.

In one or more embodiments, suitable solvents include those organiccompounds that will not undergo polymerization or incorporation intopropagating polymer chains during the polymerization of monomer in thepresence of the catalyst or initiator. In one or more embodiments, theseorganic species are liquid at ambient temperature and pressure. In oneor more embodiments, these organic solvents are inert to the catalyst orinitiator. Exemplary organic solvents include hydrocarbons with a low orrelatively low boiling point such as aromatic hydrocarbons, aliphatichydrocarbons, and cycloaliphatic hydrocarbons. Non-limiting examples ofaromatic hydrocarbons include benzene, toluene, xylenes, ethylbenzene,diethylbenzene, and mesitylene. Non-limiting examples of aliphatichydrocarbons include n-pentane, n-hexane, n-heptane, n-octane, n-nonane,n-decane, isopentane, isohexanes, isopentanes, isooctanes,2,2-dimethylbutane, petroleum ether, kerosene, and petroleum spirits.And, non-limiting examples of cycloaliphatic hydrocarbons includecyclopentane, cyclohexane, methylcyclopentane, and methylcyclohexane.Mixtures of the above hydrocarbons may also be used. As is known in theart, aliphatic and cycloaliphatic hydrocarbons may be desirably employedfor environmental reasons. The low-boiling hydrocarbon solvents aretypically separated from the polymer upon completion of thepolymerization.

Other examples of organic solvents include high-boiling hydrocarbons ofhigh molecular weights, including hydrocarbon oils that are commonlyused to oil-extend polymers. Examples of these oils include paraffinicoils, aromatic oils, naphthenic oils, vegetable oils other than castoroils, and low PCA oils including MES, TDAE, SRAE, heavy naphthenic oils.Since these hydrocarbons are non-volatile, they typically do not requireseparation and remain incorporated in the polymer.

The production of the reactive polymer according to this invention canbe accomplished by polymerizing conjugated diene monomer, optionallytogether with monomer copolymerizable with conjugated diene monomer, inthe presence of a catalytically effective amount of the catalyst orinitiator. The introduction of the catalyst or initiator, the conjugateddiene monomer, optionally the comonomer, and any solvent, if employed,forms a polymerization mixture in which the reactive polymer is formed.The amount of the catalyst or initiator to be employed may depend on theinterplay of various factors such as the type of catalyst or initiatoremployed, the purity of the ingredients, the polymerization temperature,the polymerization rate and conversion desired, the molecular weightdesired, and many other factors. Accordingly, a specific catalyst orinitiator amount cannot be definitively set forth except to say thatcatalytically effective amounts of the catalyst or initiator may beused.

In one or more embodiments, the amount of the coordinating metalcompound (e.g., a lanthanide-containing compound) used can be variedfrom about 0.001 to about 2 mmol, in other embodiments from about 0.005to about 1 mmol, and in still other embodiments from about 0.01 to about0.2 mmol per 100 gram of monomer.

In other embodiments, where an anionic initiator (e.g., an alkyllithiumcompound) is employed, the initiator loading may be varied from about0.05 to about 100 mmol, in other embodiments from about 0.1 to about 50mmol, and in still other embodiments from about 0.2 to about 5 mmol per100 gram of monomer.

In one or more embodiments, the polymerization may be carried out in apolymerization system that includes a substantial amount of solvent. Inone embodiment, a solution polymerization system may be employed inwhich both the monomer to be polymerized and the polymer formed aresoluble in the solvent. In another embodiment, a precipitationpolymerization system may be employed by choosing a solvent in which thepolymer formed is insoluble. In both cases, an amount of solvent inaddition to the amount of solvent that may be used in preparing thecatalyst or initiator is usually added to the polymerization system. Theadditional solvent may be the same as or different from the solvent usedin preparing the catalyst or initiator. Exemplary solvents have been setforth above. In one or more embodiments, the solvent content of thepolymerization mixture may be more than 20% by weight, in otherembodiments more than 50% by weight, and in still other embodiments morethan 80% by weight based on the total weight of the polymerizationmixture.

In other embodiments, the polymerization system employed may begenerally considered a bulk polymerization system that includessubstantially no solvent or a minimal amount of solvent. Those skilledin the art will appreciate the benefits of bulk polymerization processes(i.e., processes where monomer acts as the solvent), and therefore thepolymerization system includes less solvent than will deleteriouslyimpact the benefits sought by conducting bulk polymerization. In one ormore embodiments, the solvent content of the polymerization mixture maybe less than about 20% by weight, in other embodiments less than about10% by weight, and in still other embodiments less than about 5% byweight based on the total weight of the polymerization mixture. Inanother embodiment, the polymerization mixture contains no solventsother than those that are inherent to the raw materials employed. Instill another embodiment, the polymerization mixture is substantiallydevoid of solvent, which refers to the absence of that amount of solventthat would otherwise have an appreciable impact on the polymerizationprocess. Polymerization systems that are substantially devoid of solventmay be referred to as including substantially no solvent. In particularembodiments, the polymerization mixture is devoid of solvent.

The polymerization may be conducted in any conventional polymerizationvessels known in the art. In one or more embodiments, solutionpolymerization can be conducted in a conventional stirred-tank reactor.In other embodiments, bulk polymerization can be conducted in aconventional stirred-tank reactor, especially if the monomer conversionis less than about 60%. In still other embodiments, especially where themonomer conversion in a bulk polymerization process is higher than about60%, which typically results in a highly viscous cement, the bulkpolymerization may be conducted in an elongated reactor in which theviscous cement under polymerization is driven to move by piston, orsubstantially by piston. For example, extruders in which the cement ispushed along by a self-cleaning single-screw or double-screw agitatorare suitable for this purpose. Examples of useful bulk polymerizationprocesses are disclosed in U.S. Pat. No. 7,351,776, which isincorporated herein by reference.

In one or more embodiments, all of the ingredients used for thepolymerization can be combined within a single vessel (e.g., aconventional stirred-tank reactor), and all steps of the polymerizationprocess can be conducted within this vessel. In other embodiments, twoor more of the ingredients can be pre-combined in one vessel and thentransferred to another vessel where the polymerization of monomer (or atleast a major portion thereof) may be conducted.

The polymerization can be carried out as a batch process, a continuousprocess, or a semi-continuous process. In the semi-continuous process,the monomer is intermittently charged as needed to replace that monomeralready polymerized. In one or more embodiments, the conditions underwhich the polymerization proceeds may be controlled to maintain thetemperature of the polymerization mixture within a range from about −10°C. to about 200° C., in other embodiments from about 0° C. to about 150°C., and in other embodiments from about 20° C. to about 100° C. In oneor more embodiments, the heat of polymerization may be removed byexternal cooling by a thermally controlled reactor jacket, internalcooling by evaporation and condensation of the monomer through the useof a reflux condenser connected to the reactor, or a combination of thetwo methods. Also, the polymerization conditions may be controlled toconduct the polymerization under a pressure of from about 0.1 atmosphereto about 50 atmospheres, in other embodiments from about 0.5 atmosphereto about 20 atmosphere, and in other embodiments from about 1 atmosphereto about 10 atmospheres. In one or more embodiments, the pressures atwhich the polymerization may be carried out include those that ensurethat the majority of the monomer is in the liquid phase. In these orother embodiments, the polymerization mixture may be maintained underanaerobic conditions.

Regardless of whether the polymerization is catalyzed or initiated by acoordination catalyst (e.g., a lanthanide-based catalyst) or an anionicinitiator (e.g., an alkyllithium initiator), some or all of theresulting polymer chains may possess reactive chain ends before thepolymerization mixture is quenched. Thus, reference to a reactivepolymer refers to a polymer having a reactive chain end deriving from asynthesis of the polymer by using a coordination catalyst or an anionicinitiator. As noted above, the reactive polymer prepared with acoordination catalyst (e.g., a lanthanide-based catalyst) may bereferred to as a pseudo-living polymer, and the reactive polymerprepared with an anionic initiator (e.g., an alkyllithium initiator) maybe referred to as a living polymer. In one or more embodiments, apolymerization mixture including reactive polymer may be referred to asan active polymerization mixture. The percentage of polymer chainspossessing a reactive end depends on various factors such as the type ofcatalyst or initiator, the type of monomer, the purity of theingredients, the polymerization temperature, the monomer conversion, andmany other factors. In one or more embodiments, at least about 20% ofthe polymer chains possess a reactive end, in other embodiments at leastabout 50% of the polymer chains possess a reactive end, and in stillother embodiments at least about 80% of the polymer chains possess areactive end. In any event, the reactive polymer can be reacted with ahalosilane-activated nitrogen heterocycle containing a pendantfunctional group.

In one or more embodiments, halosilane-activated nitrogen heterocyclescontaining a pendant functional group include nitrogen heterocyclescontaining a pendant functional group that are activated by combiningthe heterocycles with a halosilane. Without wishing to be bound by anyparticular mechanism or theory, it is believed that when a halosilaneinteracts with a lone pair of electrons on the nitrogen containingheterocycle, the heterocycle is activated.

In one or more embodiments, the nitrogen heterocycle containing apendant functional group includes a nitrogen-containing heterocyclicgroup wherein a ring nitrogen atom includes a free electron pair, andwhere a functional group is tethered directly or indirectly to the ring(i.e. pendant to the ring).

In one or more embodiments, the nitrogen-containing heterocyclic groupmay contain unsaturation. In other embodiments, the nitrogen-containingheterocyclic group may be saturated. In one or more embodiments, thenitrogen-containing heterocyclic group may be aromatic. In otherembodiments, the nitrogen-containing heterocyclic group may benon-aromatic.

Specific examples of nitrogen-containing heterocylic groups include, butare not limited to 2-pyridyl, 3-pyridyl, 4-pyridyl, pyrazinyl,2-pyrimidinyl, 4-pyrimidinyl, 5-pyrimidinyl, 3-pyridazinyl,4-pyridazinyl, N-methyl-2-imidazolyl, N-methyl-4-imidazolyl,N-methyl-5-imidazolyl, N-methyl-3-pyrazolyl, N-methyl-4-pyrazolyl,N-methyl-5-pyrazolyl, N-methyl-1,2,3-triazol-4-yl,N-methyl-1,2,3-triazol-5-yl, N-methyl-1,2,4-triazol-3-yl,N-methyl-1,2,4-triazol-5-yl, 1,2,4-triazin-3-yl, 1,2,4-triazin-5-yl,1,2,4-triazin-6-yl, 1,3,5-triazinyl, N-methyl-2-imidazolin-2-yl,N-methyl-2-imidazolin-4-yl, N-methyl-2-imidazolin-5-yl,N-methyl-2-pyrazolin-3-yl, N-methyl-2-pyrazolin-4-yl,N-methyl-2-pyrazolin-5-yl, 2-quinolyl, 3-quinolyl, 4-quinolyl,1-isoquinolyl, 3-isoquinolyl, 4-isoquinolyl, 1-indolizinyl,2-indolizinyl, 3-indolizinyl, 1-phthalazinyl, 2-quinazolinyl,4-quinazolinyl, 2-quinoxalinyl, 3-cinnolinyl, 4-cinnolinyl,1-methylindazol-3-yl, 1,5-naphthyridin-2-yl, 1,5-naphthyridin-3-yl,1,5-naphthyridin-4-yl, 1,8-naphthyridin-2-yl, 1,8-naphthyridin-3-yl,1,8-naphthyridin-4-yl, 2-pteridinyl, 4-pteridinyl, 6-pteridinyl,7-pteridinyl, 1-methylbenzimidazol-2-yl, 6-phenanthridinyl,N-methyl-2-purinyl, N-methyl-6-purinyl, N-methyl-8-purinyl,N-methyl-β-carbolin-1-yl, N-methyl-β-carbolin-3-yl,N-methyl-β-carbolin-4-yl, 9-acridinyl, 1, 7-phenanthrolin-2-yl, 1,7-phenanthrolin-3-yl, 1,7-phenanthrolin-4-yl, 1,10-phenanthrolin-2-yl,1,10-phenanthrolin-3-yl, 1,10-phenanthrolin-4-yl,4,7-phenanthrolin-1-yl, 4,7-phenanthrolin-2-yl, 4,7-phenanthrolin-3-yl,1-phenazinyl, and 2-phenazinyl groups.

In one or more embodiments, the pendant functional group includes aheteroatom. In these or other embodiments, the pendant functional groupincludes a substituent that will react or interact with reinforcingfiller or react with a reactive polymer. In one or more embodiments, thefunctional group, when imparted to the end of a polymer chain inaccordance with this invention, provides the polymer chain end with afunctional group (i.e. functionalized polymer) that reduces the 50° C.hysteresis loss of a carbon-black filled vulcanizate prepared from thefunctionalized polymer as compared to similar carbon-black filledvulcanizates prepared from non-functionalized polymer. In one or moreembodiments, this reduction in hysteresis loss is at least 5%, in otherembodiments at least 10%, and in other embodiments at least 15%. In oneor more embodiments, multiple functional groups may be directly orindirectly tethered to the nitrogen-containing heterocyclic group.

Examples of functional groups that may be directly or indirectlytethered to the nitrogen-containing heterocyclic group include, but arenot limited to, cyano groups, imine groups, protected oxime groups, andprotected amino groups.

Those skilled in the art will recognize that cyano groups may be definedby the formula —C≡N.

Those skilled in the art will recognize that imine groups may be definedby the formula:

In one or more embodiments, an imine group may be defined by theformula:

where R³ is a monovalent organic group and R⁴ is a hydrogen atom or amonovalent organic group.

Those skilled in the art will recognize that protected oxime groups maybe defined by the formula:

where R⁵ is a hydrogen atom or a monovalent organic group and R⁶ is amonovalent organic group.

In one or more embodiments, the monovalent organic groups may includehydrocarbyl groups, which include, but are not limited to, alkyl,cycloalkyl, alkenyl, cycloalkenyl, aryl, allyl, aralkyl, alkaryl, oralkynyl groups. Hydrocarbyl groups also include substituted hydrocarbylgroups, which refer to hydrocarbyl groups in which one or more hydrogenatoms have been replaced by a substituent such as a hydrocarbyl,hydrocarbyloxy, silyl, or silyloxy group. In one or more embodiments,these groups may include from one, or the appropriate minimum number ofcarbon atoms to form the group, to about 20 carbon atoms. These groupsmay also contain heteroatoms such as, but not limited to, nitrogen,boron, oxygen, silicon, sulfur, tin, and phosphorus atoms.

In one or more embodiments, the monovalent organic groups may includesilyl groups, which include, but are not limited to,trihydrocarbylsilyl, dihydrocarbylhydrosilyl, orhydrocarbyldihydrosilyl. Silyl groups also include substituted silylgroups, which refer to silyl groups in which one or more hydrogen atomshave been replaced by a substituent such as a hydrocarbyl,hydrocarbyloxy, silyl, or silyloxy group. In one or more embodiments,these groups may include from one, or the appropriate minimum number ofcarbon atoms to form the group, to about 20 carbon atoms. These groupsmay include heteroatoms such as, but not limited to, nitrogen, boron,oxygen, silicon, sulfur, tin, and phosphorus atoms, in addition to theparent silicon atom.

Those skilled in the art will recognize that protected amino groupsinclude those amino groups that are formed or derived by replacing thetwo hydrogen atoms of a parent amino group (i.e. —NH₂) with othersubstituents such as hydrocarbyl or silyl groups. Where the two hydrogenatoms of a parent amino group are replaced by a hydrocarbyl and a silylgroup, the resulting protected amino group may be referred to as a(hydrocarbyl)(silyl)amino group. Where the two hydrogen atoms of aparent amino group are replaced by two silyl groups, the resultingprotected amino group may be referred to as a disilylamino group. Wherethe two hydrogen atoms of a parent amino group are replaced by twohydrocarbyl groups, the resulting protected amino group may be referredto as a dihydrocarbylamino group.

Exemplary types of protected amino groups include, but are not limitedto, bis(trihydrocarbylsilyl)amino, bis(dihydrocarbylhydrosilyl)amino,1-aza-disila-1-cyclohydrocarbyl,(hydrocarbyl)(trihydrocarbylsilyl)amino,(hydrocarbyl)(dihydrocarbylhydrosilyl)amino,1-aza-2-sila-1-cyclohydrocarbyl, dihydrocarbylamino, and1-aza-1-cyclohydrocarbyl groups.

Specific examples of bis(trihydrocarbylsilyl)amino groups include, butare not limited to, bis(trimethylsilyl)amino, bis(triethylsilyl)amino,bis(triisopropylsilyl)amino, bis(tri-n-propylsilyl)amino,bis(triisobutylsilyl)amino, bis(tri-t-butylsilyl)amino, andbis(triphenylsilyl)amino groups.

Specific examples of bis(dihydrocarbylhydrosilyl)amino groups include,but are not limited to, bis(dimethylhydrosilyl)amino,bis(diethylhydrosilyl)amino, bis(diisopropylhydrosilyl)amino,bis(di-n-propylhydrosilyl)amino, bis(diisobutylhydrosilyl)amino,bis(di-t-butylhydrosilyl)amino, and bis(diphenylhydrosilyl)amino groups.

Specific examples of 1-aza-disila-1-cyclohydrocarbyl groups include, butare not limited to, 2,2,5,5-tetramethyl-1-aza-2,5-disila-1-cyclopentyl,2,2,5,5-tetraethyl-1-aza-2,5-disila-1-cyclopentyl,2,2,5,5-tetraphenyl-1-aza-2,5-disila-1-cyclopentyl,2,2,6,6-tetramethyl-1-aza-2,6-disila-1-cyclohexyl,2,2,6,6-tetraethyl-1-aza-2,6-disila-1-cyclohexyl, and2,2,6,6-tetraphenyl-1-aza-2,6-disila-1-cyclohexyl groups.

Specific examples of (hydrocarbyl)(trihydrocarbylsilyl)amino groupsinclude, but are not limited to, (methyl)(trimethylsilyl)amino,(methyl)(triethylsilyl)amino, (methyl)(triphenylsilyl)amino,(ethyl)(trimethylsilyl)amino, (phenyl)(triethylsilyl)amino, and(methyl)(triisopropylsilyl)amino groups.

Specific examples of (hydrocarbyl)(dihydrocarbylhydrosilyl)amino groupsinclude, but are not limited to, (methyl)(dimethylhydrosilyl)amino,(methyl)(diethylhydrosilyl)amino, (methyl)(diisopropylhydrosilyl)amino,(ethyl)(di-n-propylhydrosilyl)amino,(phenyl)(diisobutylhydrosilyl)amino,(phenyl)(di-t-butylhydrosilyl)amino, and(phenyl)(diphenylhydrosilyl)amino groups.

Specific examples of 1-aza-2-sila-1-cyclohydrocarbyl groups include, butare not limited to, 2,2-dimethyl-1-aza-2-sila-1-cyclopentyl,2,2-diethyl-1-aza-2-sila-1-cyclopentyl,2,2-diphenyl-1-aza-2-sila-1-cyclopentyl,2,2-diisopropyl-1-aza-2-sila-1-cyclohexyl,2,2-dibutyl-1-aza-2-sila-1-cyclohexyl, and2,2-diphenyl-1-aza-2-sila-1-cyclohexyl groups.

Specific examples of dihydrocarbylamino groups include, but are notlimited to, dimethylamino, diethylamino, di-n-propylamino,diisopropylamino, di-n-butylamino, diisobutylamino, dicyclohexylamino,diphenylamino, dibenzylamino, (methyl)(cyclohexyl)amino,(ethyl)(cyclohexyl)amino, (methyl)(phenyl)amino, (ethyl)(phenyl)amino,(methyl)(benzyl)amino, and (ethyl)(benzyl)amino groups.

Specific examples of 1-aza-1-cyclohydrocarbyl groups include, but arenot limited to, aziridino, azetidino, pyrrolidino, piperidino,homopiperdino, morpholino, N-methylpiperazino, andN-methylhomopiperazino groups.

In one or more embodiments, the functionalized nitrogen heterocycle maybe defined by the formula I:

where R⁷ is a trivalent group and Z is a substituent that will react orinteract with a reinforcing filler or react with a reactive polymer. Inone or more embodiments, R⁷ forms an unsaturated ring that may bearomatic or non-aromatic. In other embodiments, R⁷ forms a saturatedring.

In one or more embodiments, where the functionalized nitrogenheterocycle of formula I is a cyano-containing, nitrogen heterocycle thefunctionalized nitrogen heterocycle may be defined by the formula II:

where R⁷ is a trivalent group. In one or more embodiments, R⁷ forms anunsaturated ring that may be aromatic or non-aromatic. In otherembodiments, R⁷ forms a saturated ring.

In one or more embodiments, where the functionalized nitrogenheterocycle of formula I is a nitrogen heterocycle containing an iminegroup the functionalized nitrogen heterocycle may be defined by theformula III:

where R³ is a monovalent organic group, R⁴ is a hydrogen atom or amonovalent organic group, and R⁷ is a trivalent group. In one or moreembodiments, R⁷ forms an unsaturated ring that may be aromatic ornon-aromatic. In other embodiments, R⁷ forms a saturated ring.

In one or more embodiments, where the functionalized nitrogenheterocycle of formula I is a nitrogen heterocycle containing aprotected oxime group the functionalized nitrogen heterocycle may bedefined by the formula IV:

where R⁵ is a hydrogen atom or a monovalent organic group, R⁶ is amonovalent organic group, and R⁷ is a trivalent group. In one or moreembodiments, R⁷ forms an unsaturated ring that may be aromatic ornon-aromatic. In other embodiments, R⁷ forms a saturated ring.

In one or more embodiments, where the functionalized nitrogenheterocycle of formula I is a nitrogen heterocycle containing aprotected amino group the functionalized nitrogen heterocycle may bedefined by the formula V:

where R⁸ and R⁹ are each independently a monovalent organic group or ahydrolyzable group or where R⁸ and R⁹ join to form a divalent organicgroup, and R⁷ is a trivalent group. In one or more embodiments, R⁷ formsan unsaturated ring that may be aromatic or non-aromatic. In otherembodiments, R⁷ forms a saturated ring.

In one or more embodiments, the divalent organic groups may includehydrocarbylene groups, which include, but are not limited to, alkylene,cycloalkylene, alkenylene, cycloalkenylene, alkynylene, cycloalkynylene,or arylene groups. Hydrocarbylene groups include substitutedhydrocarbylene groups, which refer to hydrocarbylene groups in which oneor more hydrogen atoms have been replaced by a substituent such as ahydrocarbyl, hydrocarbyloxy, silyl, or silyloxy group. In one or moreembodiments, these groups may include from one, or the appropriateminimum number of carbon atoms to form the group, to about 20 carbonatoms. These groups may also contain one or more heteroatoms such as,but not limited to, nitrogen, oxygen, boron, silicon, sulfur, tin, andphosphorus atoms.

In one or more embodiments, where R⁸ and R⁹ of formula V are bothhydrocarbyl groups, the nitrogen heterocycle containing a protectedamino group may be referred to as a (dihydrocarbylamino)heterocycle. Inother embodiments, where R⁸ and R⁹ of formula V are bothtrihydrocarbylsilyl groups, the nitrogen heterocycle containing aprotected amino group may be referred to as a[bis(trihydrocarbylsilyl)amino]heterocycle. In one or more embodiments,where one of R⁸ and R⁹ of formula V is a hydrocarbyl group and one of R⁸and R⁹ of formula I is a trihydrocarbylsilyl group, the nitrogenheterocycle containing a protected amino group may be referred to as a[(hydrocarbyl)(trihydrocarbylsilyl)amino]heterocycle.

In other embodiments, where R⁸ and R⁹ of formula V are bothdihydrocarbylhydrosilyl groups, the nitrogen heterocycle containing aprotected amino group may be referred to as a[bis(dihydrocarbylhydrosilyl)amino]heterocycle. In one or moreembodiments, where one of R⁸ and R⁹ of formula V is a hydrocarbyl groupand one of R⁸ and R⁹ of formula V is a dihydrocarbylhydrosilyl group,the nitrogen heterocycle containing a protected amino group may bereferred to as a[(hydrocarbyl)(dihydrocarbylhydrosilyl)amino]heterocycle. In one or moreembodiments, where R⁸ and R⁹ of formula V join to form a divalenthydrocarbylene group, the nitrogen heterocycle containing a protectedamino group may be referred to as a(1-aza-1-cyclohydrocarbyl)heterocycle. In other embodiments, where an R⁸and R⁹ of formula V are both silyl groups and join to form a divalenthydrocarbylene group, the nitrogen heterocycle containing a protectedamino group may be referred to as a(1-aza-disila-1-cyclohydrocarbyl)heterocycle. In one or moreembodiments, where R⁸ and R⁹ of formula V is a silyl group R⁸ and R⁹join to form a divalent group, the nitrogen heterocycle containing aprotected amino group may be referred to as a(1-aza-2-sila-1-cyclohydrocarbyl) heterocycle.

Specific examples of nitrogen heterocycles containing a pendant cyanofunctional group include, but are not limited to,2-pyridinecarbonitrile, 3-pyridinecarbonitrile, 4-pyridinecarbonitrile,pyrazinecarbonitrile, 2-pyrimidinecarbonitrile,4-pyrimidinecarbonitrile, 5-pyrimidinecarbonitrile,3-pyridazinecarbonitrile, 4-pyridazinecarbonitrile,N-methyl-2-imidazolecarbonitrile, N-methyl-4-imidazolecarbonitrile,N-methyl-5-imidazolecarbonitrile, N-methyl-3-pyrazolecarbonitrile,N-methyl-4-pyrazolecarbonitrile, N-methyl-5-pyrazolecarbonitrile,N-methyl-1,2,3-triazole-4-carbonitrile,N-methyl-1,2,3-triazole-5-carbonitrile,N-methyl-1,2,4-triazole-3-carbonitrile,N-methyl-1,2,4-triazole-5-carbonitrile, 1,2,4-triazine-3-carbonitrile,1,2,4-triazine-5-carbonitrile, 1,2,4-triazine-6-carbonitrile,1,3,5-triazinecarbonitrile, N-methyl-2-imidazoline-2-carbonitrile,N-methyl-2-imidazoline-4-carbonitrile,N-methyl-2-imidazoline-5-carbonitrile,N-methyl-2-pyrazoline-3-carbonitrile,N-methyl-2-pyrazoline-4-carbonitrile,N-methyl-2-pyrazoline-5-carbonitrile, 2-quinolinecarbonitrile,3-quinolinecarbonitrile, 4-quinolinecarbonitrile,1-isoquinolinecarbonitrile, 3-isoquinolinecarbonitrile,4-isoquinolinecarbonitrile, 1-indolizinecarbonitrile,2-indolizinecarbonitrile, 3-indolizinecarbonitrile,1-phthalazinecarbonitrile, 2-quinazolinecarbonitrile,4-quinazolinecarbonitrile, 2-quinoxalinecarbonitrile,3-cinnolinecarbonitrile, 4-cinnolinecarbonitrile,1-methylindazole-3-carbonitrile, 1,5-naphthyridine-2-carbonitrile,1,5-naphthyridine-3-carbonitrile, 1,5-naphthyridine-4-carbonitrile,1,8-naphthyridine-2-carbonitrile, 1,8-naphthyridine-3-carbonitrile,1,8-naphthyridine-4-carbonitrile, 2-pteridinecarbonitrile,4-pteridinecarbonitrile, 6-pteridinecarbonitrile,7-pteridinecarbonitrile, 1-methylbenzimidazole-2-carbonitrile,phenanthridine-6-carbonitrile, N-methyl-2-purinecarbonitrile,N-methyl-6-purinecarbonitrile, N-methyl-8-purinecarbonitrile,9-acridinecarbonitrile, 1, 7-phenanthroline-2-carbonitrile, 1,7-phenanthroline-3-carbonitrile, 1, 7-phenanthroline-4-carbonitrile,1,10-phenanthroline-2-carbonitrile, 1,10-phenanthroline-3-carbonitrile,1,10-phenanthroline-4-carbonitrile, 4,7-phenanthroline-1-carbonitrile,4,7-phenanthroline-2-carbonitrile, 4,7-phenanthroline-3-carbonitrile,1-phenazinecarbonitrile, and 2-phenazinecarbonitrile.

Specific examples of nitrogen heterocycles containing a pendantdihydrocarbylamino functional group include, but are not limited to,2-(dimethylamino)pyridine, 2-(diethylamino)pyridine,2-(diphenylamino)pyridine, N-methyl-4-(dimethylamino)pyrazole,N-methyl-4-(diethylamino)pyrazole, N-methyl-4-(diphenylamino)pyrazole,N-(trimethylsilyl)-4-(dimethylamino)pyrazole,N-(trimethylsilyl)-4-(diethylamino)pyrazole,N-(trimethylsilyl)-4-(diphenylamino)pyrazole,N-methyl-4-(dimethylamino)imidazole, N-methyl-4-(diethylamino)imidazole,N-methyl-4-(diphenyl amino)imidazole, N-(trimethylsilyl)-4-(dimethylamino)imidazole, N-(trimethylsilyl)-4-(diethylamino)imidazole, andN-(trimethylsilyl)-4-(diphenylamino)imidazole.

Specific examples of nitrogen heterocycles containing a pendantbis(trihydrocarbylsilyl)amino functional group include, but are notlimited to, 2-[bis(trimethylsilyl)amino]pyridine,2-[bis(triethylsilyl)amino]pyridine,2-[bis(triisopropylsilyl)amino]pyridine,2-[bis(tri-n-propylsilyl)amino]pyridine,2-[bis(triisobutylsilyl)amino]pyridine,2-[bis(tri-t-butylsilyl)amino]pyridine,2-[bis(triphenylsilyl)amino]pyridine,2-[(trimethylsilyl)(triethylsilyl)amino]pyridine,2-[(trimethylsilyl)(triphenylsilyl)amino]pyridine,2-[(triethylsilyl)(triphenylsilyl)amino]pyridine,N-methyl-4-[bis(trimethylsilyl)amino]pyrazole,N-methyl-4-[bis(triethylsilyl)amino]pyrazole,N-methyl-4-[bis(triisopropylsilyl)amino]pyrazole,N-methyl-4-[bis(tri-n-propylsilyl)amino]pyrazole,N-methyl-4-[bis(triisobutylsilyl)amino]pyrazole,N-methyl-4-[bis(tri-t-butylsilyl)amino]pyrazole,N-methyl-4-[bis(triphenylsilyl)amino]pyrazole,N-methyl-4-[(trimethylsilyl)(triethylsilyl)amino]pyrazole,N-methyl-4-[(trimethylsilyl)(triphenylsilyl)amino]pyrazole,N-methyl-4-[(triethylsilyl)(triphenylsilyl)amino]pyrazole,N-(trimethylsilyl)-4-[bis(trimethylsilyl)amino]pyrazole,N-(trimethylsilyl)-4-[bis(triethylsilyl)amino]pyrazole,N-(trimethylsilyl)-4-[bis(triisopropylsilyl)amino]pyrazole,N-(trimethylsilyl)-4-[bis(tri-n-propylsilyl)amino]pyrazole,N-(trimethylsilyl)-4-[bis(triisobutylsilyl)amino]pyrazole,N-(trimethylsilyl)-4-[bis(tri-t-butylsilyl)amino]pyrazole,N-(trimethylsilyl)-4-[bis(triphenylsilyl)amino]pyrazole,N-(trimethylsilyl)-4-[(trimethylsilyl)(triethylsilyl)amino]pyrazole,N-(trimethylsilyl)-4-[(trimethylsilyl)(triphenylsilyl)amino]pyrazole,N-(trimethylsilyl)-4-[(triethylsilyl)(triphenylsilyl)amino]pyrazole,N-methyl-4-[bis(trimethylsilyl)amino]imidazole,N-methyl-4-[bis(triethylsilyl)amino]imidazole,N-methyl-4-[bis(triisopropylsilyl)amino]imidazole,N-methyl-4-[bis(tri-n-propylsilyl)amino]imidazole,N-methyl-4-[bis(triisobutylsilyl)amino]imidazole,N-methyl-4-[bis(tri-t-butylsilyl)amino]imidazole,N-methyl-4-[bis(triphenylsilyl)amino]imidazole,N-methyl-4-[(trimethylsilyl)(triethylsilyl)amino]imidazole,N-methyl-4-[(trimethylsilyl)(triphenylsilyl)amino]imidazole,N-methyl-4-[(triethylsilyl)(triphenylsilyl)amino]imidazole,N-(trimethylsilyl)-4-[bis(trimethylsilyl)amino]imidazole,N-(trimethylsilyl)-4-[bis(triethylsilyl)amino]imidazole,N-(trimethylsilyl)-4-[bis(triisopropylsilyl)amino]imidazole,N-(trimethylsilyl)-4-[bis(tri-n-propylsilyl)amino]imidazole,N-(trimethylsilyl)-4-[bis(triisobutylsilyl)amino]imidazole,N-(trimethylsilyl)-4-[bis(tri-t-butylsilyl)amino]imidazole,N-(trimethylsilyl)-4-[bis(triphenylsilyl)amino]imidazole,N-(trimethylsilyl)-4-[(trimethylsilyl)(triethylsilyl)amino]imidazole,N-(trimethylsilyl)-4-[(trimethylsilyl)(triphenylsilyl)amino]imidazole,andN-(trimethylsilyl)-4-[(triethylsilyl)(triphenylsilyl)amino]imidazole.

Specific examples of nitrogen heterocycles containing a pendant(hydrocarbyl)(trihydrocarbylsilyl)amino functional group include, butare not limited to, 2-[(methyl)(trimethylsilyl)amino]pyridine,2-[(ethyl)(triethylsilyl)amino]pyridine,2-[(phenyl)(triphenylsilyl)amino]pyridine,2-[(methyl)(triethylsilyl)amino]pyridine,2-[(ethyl)(trimethylsilyl)amino]pyridine,2-[(phenyl)(trimethylsilyl)amino]pyridine,2-[(methyl)(triphenylsilyl)amino]pyridine,2-[(ethyl)(triphenylsilyl)amino]pyridine,2-[(phenyl)(triethylsilyl)amino]pyridine,N-methyl-4-[(methyl)(trimethylsilyl)amino]pyrazole,N-methyl-4-[(ethyl)(triethylsilyl)amino]pyrazole,N-methyl-4-[(phenyl)(triphenylsilyl)amino]pyrazole,N-methyl-4-[(methyl)(triethylsilyl)amino]pyrazole,N-methyl-4-[(ethyl)(trimethylsilyl)amino]pyrazole,N-methyl-4-[(phenyl)(trimethylsilyl)amino]pyrazole,N-methyl-4-[(methyl)(triphenylsilyl)amino]pyrazole,N-methyl-4-[(ethyl)(triphenylsilyl)amino]pyrazole,N-methyl-4-[(phenyl)(triethylsilyl)amino]pyrazole,N-(trimethylsilyl)-4-[(methyl)(trimethylsilyl)amino]pyrazole,N-(trimethylsilyl)-4-[(ethyl)(triethylsilyl)amino]pyrazole,N-(trimethylsilyl)-4-[(phenyl)(triphenylsilyl)amino]pyrazole,N-(trimethylsilyl)-4-[(methyl)(triethylsilyl)amino]pyrazole,N-(trimethylsilyl)-4-[(ethyl)(trimethylsilyl)amino]pyrazole,N-(trimethylsilyl)-4-[(phenyl)(trimethylsilyl)amino]pyrazole,N-(trimethylsilyl)-4-[(methyl)(triphenylsilyl)amino]pyrazole,N-(trimethylsilyl)-4-[(ethyl)(triphenylsilyl)amino]pyrazole,N-(trimethylsilyl)-4-[(phenyl)(triethylsilyl)amino]pyrazole,N-methyl-4-[(methyl)(trimethylsilyl)amino]imidazole,N-methyl-4-[(ethyl)(triethylsilyl)amino]imidazole,N-methyl-4-[(phenyl)(triphenylsilyl)amino]imidazole,N-methyl-4-[(methyl)(triethylsilyl)amino]imidazole,N-methyl-4-[(ethyl)(trimethylsilyl)amino]imidazole,N-methyl-4-[(phenyl)(trimethylsilyl)amino]imidazole,N-methyl-4-[(methyl)(triphenylsilyl)amino]imidazole,N-methyl-4-[(ethyl)(triphenylsilyl)amino]imidazole,N-methyl-4-[(phenyl)(triethylsilyl)amino]imidazole,N-(trimethylsilyl)-4-[(methyl)(trimethylsilyl)amino]imidazole,N-(trimethylsilyl)-4-[(ethyl)(triethylsilyl)amino]imidazole,N-(trimethylsilyl)-4-[(phenyl)(triphenylsilyl)amino]imidazole,N-(trimethylsilyl)-4-[(methyl)(triethylsilyl)amino]imidazole,N-(trimethylsilyl)-4-[(ethyl)(trimethylsilyl)amino]imidazole,N-(trimethylsilyl)-4-[(phenyl)(trimethylsilyl)amino]imidazole,N-(trimethylsilyl)-4-[(methyl)(triphenylsilyl)amino]imidazole,N-(trimethylsilyl)-4-[(ethyl)(triphenylsilyl)amino]imidazole, andN-(trimethylsilyl)-4-[(phenyl)(triethylsilyl)amino]imidazole.

Specific examples of nitrogen heterocycles containing a pendantbis(dihydrocarbylhydrosilyl)amino functional group include, but are notlimited to, 2-[bis(dimethylhydrosilyl)amino]pyridine,2-[bis(diethylhydrosilyl)amino]pyridine,2-[bis(diisopropylhydrosilyl)amino]pyridine,N-methyl-4-[bis(dimethylhydrosilyl)amino]pyrazole,N-methyl-4-[bis(diethylhydrosilyl)amino]pyrazole,N-methyl-4-[bis(diisopropylhydrosilyl)amino]pyrazole,N-(trimethylsilyl)-4-[bis(dimethylhydrosilyl)amino]pyrazole,N-(trimethylsilyl)-4-[bis(diethylhydrosilyl)amino]pyrazole,N-(trimethylsilyl)-4-[bis(diisopropylhydrosilyl)amino]pyrazole,N-methyl-4-[bis(dimethylhydrosilyl)amino]imidazole,N-methyl-4-[bis(diethylhydrosilyl)amino]imidazole,N-methyl-4-[bis(diisopropylhydrosilyl)amino]imidazole,N-(trimethylsilyl)-4-[bis(dimethylhydrosilyl)amino]imidazole,N-(trimethylsilyl)-4-[bis(diethylhydrosilyl)amino]imidazole, andN-(trimethylsilyl)-4-[bis(diisopropylhydrosilyl)amino]imidazole.

Specific examples of nitrogen heterocycles containing a pendant(hydrocarbyl)(dihydrocarbylhydrosilyl)amino functional group include,but are not limited to, 2-[(methyl)(dimethylhydrosilyl)amino]pyridine,2-[(methyl)(diethylhydrosilyl)amino]pyridine,2-[(methyl)(diisopropylhydrosilyl)amino]pyridine,2-[(ethyl)(dimethylhydrosilyl)amino]pyridine,2-[(ethyl)(diethylhydrosilyl)amino]pyridine,2-[(ethyl)(diisopropylhydrosilyl)amino]pyridine,N-methyl-4-[(methyl)(dimethylhydrosilyl)amino]pyrazole,N-methyl-4-[(methyl)(diethylhydrosilyl)amino]pyrazole,N-methyl-4-[(methyl)(diisopropylhydrosilyl)amino]pyrazole,N-methyl-4-[(ethyl)(dimethylhydrosilyl)amino]pyrazole,N-methyl-4-[(ethyl)(diethylhydrosilyl)amino]pyrazole,N-methyl-4-[(ethyl)(diisopropylhydrosilyl)amino]pyrazole,N-(trimethylsilyl)-4-[(methyl)(dimethylhydrosilyl)amino]pyrazole,N-(trimethylsilyl)-4-[(methyl)(diethylhydrosilyl)amino]pyrazole,N-(trimethylsilyl)-4-[(methyl)(diisopropylhydrosilyl)amino]pyrazole,N-(trimethylsilyl)-4-[(ethyl)(dimethylhydrosilyl)amino]pyrazole,N-(trimethylsilyl)-4-[(ethyl)(diethylhydrosilyl)amino]pyrazole,N-(trimethylsilyl)-4-[(ethyl)(diisopropylhydrosilyl)amino]pyrazole,N-methyl-4-[(methyl)(dimethylhydrosilyl)amino]imidazole,N-methyl-4-[(methyl)(diethylhydrosilyl)amino]imidazole,N-methyl-4-[(methyl)(diisopropylhydrosilyl)amino]imidazole,N-methyl-4-[(ethyl)(dimethylhydrosilyl)amino]imidazole,N-methyl-4-[(ethyl)(diethylhydrosilyl)amino]imidazole,N-methyl-4-[(ethyl)(diisopropylhydrosilyl)amino]imidazole,N-(trimethylsilyl)-4-[(methyl)(dimethylhydrosilyl)amino]imidazole,N-(trimethylsilyl)-4-[(methyl)(diethylhydrosilyl)amino]imidazole,N-(trimethylsilyl)-4-[(methyl)(diisopropylhydrosilyl)amino]imidazole,N-(trimethylsilyl)-4-[(ethyl)(dimethylhydrosilyl)amino]imidazole,N-(trimethylsilyl)-4-[(ethyl)(diethylhydrosilyl)amino]imidazole, andN-(trimethylsilyl)-4-[(ethyl)(diisopropylhydrosilyl)amino]imidazole.

Specific examples of nitrogen heterocycles containing a pendant1-aza-1-cyclohydrocarbyl functional group include, but are not limitedto, 2-(pyrrolidino)pyridine, 2-(aziridino)pyridine,2-(azetidino)pyridine, 2-(piperidino)pyridine,2-(homopiperidino)pyridine, 2-(morpholino)pyridine,2-(N-methylpiperazino)pyridine, 2-(N-methylhomopiperazino)-pyridine,2-(azepano)pyridine, 2-(azocano)pyridine,N-methyl-4-(pyrrolidino)pyrazole, N-methyl-4-(aziridino)pyrazole,N-methyl-4-(azetidino)pyrazole, N-methyl-4-(piperidino)pyrazole,N-methyl-4-(homopiperidino)pyrazole, N-methyl-4-(morpholino)pyrazole,N-methyl-4-(N-methylpiperazino)pyrazole,N-methyl-4-(N-methylhomopiperazino)pyrazole,N-methyl-4-(azepano)pyrazole, N-methyl-4-(azocano)pyrazole,N-(trimethylsilyl)-4-(pyrrolidino)pyrazole,N-(trimethylsilyl)-4-(aziridino)pyrazole,N-(trimethylsilyl)-4-(azetidino)pyrazole,N-(trimethylsilyl)-4-(piperidino)pyrazole,N-(trimethylsilyl)-4-(homopiperidino)pyrazole,N-(trimethylsilyl)-4-(morpholino)pyrazole,N-(trimethylsilyl)-4-(N-methylpiperazino)pyrazole,N-(trimethylsilyl)-4-(N-methylhomopiperazino)pyrazole,N-(trimethylsilyl)-4-(azepano)pyrazole,N-(trimethylsilyl)-4-(azocano)pyrazole,N-methyl-4-(pyrrolidino)imidazole, N-methyl-4-(aziridino)imidazole,N-methyl-4-(azetidino)imidazole, N-methyl-4-(piperidino)imidazole,N-methyl-4-(homopiperidino)imidazole, N-methyl-4-(morpholino)imidazole,N-methyl-4-(N-methylpiperazino)imidazole,N-methyl-4-(N-methylhomopiperazino)imidazole,N-methyl-4-(azepano)imidazole, N-methyl-4-(azocano)imidazole,N-(trimethylsilyl)-4-(pyrrolidino)imidazole,N-(trimethylsilyl)-4-(aziridino)imidazole,N-(trimethylsilyl)-4-(azetidino)imidazole,N-(trimethylsilyl)-4-(piperidino)imidazole,N-(trimethylsilyl)-4-(homopiperidino)imidazole,N-(trimethylsilyl)-4-(morpholino)imidazole,N-(trimethylsilyl)-4-(N-methylpiperazino)imidazole,N-(trimethylsilyl)-4-(N-methylhomopiperazino)imidazole,N-(trimethylsilyl)-4-(azepano)imidazole, andN-(trimethylsilyl)-4-(azocano)imidazole.

Specific examples of nitrogen heterocycles containing a pendant1-aza-disila-1-cyclohydrocarbyl functional group include, but are notlimited to,2-(2,2,5,5-tetramethyl-1-aza-2,5-disila-1-cyclopentyl)pyridine,2-(2,2,6,6-tetramethyl-1-aza-2,6-disila-1-cyclohexyl)pyridine,2-(2,2,5,5-tetraethyl-1-aza-2,5-disila-1-cyclopentyl)pyridine,2-(2,2,6,6-tetraethyl-1-aza-2,6-disila-1-cyclohexyl)pyridine,N-methyl-4-(3,3,5,5-tetramethyl-1-aza-3,5-disila-1-cyclopentyl)pyrazole,N-methyl-4-(3,3,6,6-tetramethyl-1-aza-3,6-disila-1-cyclohexyl)pyrazole,N-methyl-4-(3,3,5,5-tetraethyl-1-aza-3,5-disila-1-cyclopentyl)pyrazole,N-methyl-4-(3,3,6,6-tetraethyl-1-aza-3,6-disila-1-cyclohexyl)pyrazole,N-(trimethylsilyl)-4-(3,3,5,5-tetramethyl-1-aza-3,5-disila-1-cyclopentyl)pyrazole,N-(trimethylsilyl)-4-(3,3,6,6-tetramethyl-1-aza-3,6-disila-1-cyclohexyl)pyrazole,N-(trimethylsilyl)-4-(3,3,5,5-tetraethyl-1-aza-3,5-disila-1-cyclopentyl)pyrazole,N-(trimethylsilyl)-4-(3,3,6,6-tetraethyl-1-aza-3,6-disila-1-cyclohexyl)pyrazole,N-methyl-4-(3,3,5,5-tetramethyl-1-aza-3,5-disila-1-cyclopentyl)imidazole,N-methyl-4-(3,3,6,6-tetramethyl-1-aza-3,6-disila-1-cyclohexyl)imidazole,N-methyl-4-(3,3,5,5-tetraethyl-1-aza-3,5-disila-1-cyclopentyl)imidazole,N-methyl-4-(3,3,6,6-tetraethyl-1-aza-3,6-disila-1-cyclohexyl)imidazole,N-(trimethylsilyl)-4-(3,3,5,5-tetramethyl-1-aza-3,5-disila-1-cyclopentyl)imidazole,N-(trimethylsilyl)-4-(3,3,6,6-tetramethyl-1-aza-3,6-disila-1-cyclohexyl)imidazole,N-(trimethylsilyl)-4-(3,3,5,5-tetraethyl-1-aza-3,5-disila-1-cyclopentyl)imidazole,andN-(trimethylsilyl)-4-(3,3,6,6-tetraethyl-1-aza-3,6-disila-1-cyclohexyl)imidazole.

Specific examples of nitrogen heterocycles containing a pendant1-aza-2-sila-1-cyclohydrocarbyl functional group include, but are notlimited to, 2-(2,2-dimethyl-1-aza-2-sila-1-cyclopentyl)pyridine,2-(2,2-diethyl-1-aza-2-sila-1-cyclopentyl)pyridine,2-(2,2-diphenyl-1-aza-2-sila-1-cyclopentyl)pyridine,N-methyl-4-(2,2-dimethyl-1-aza-2-sila-1-cyclopentyl)pyrazole,N-methyl-4-(2,2-diethyl-1-aza-2-sila-1-cyclopentyl)pyrazole,N-methyl-4-(2,2-diphenyl-1-aza-2-sila-1-cyclopentyl)pyrazole,N-(trimethylsilyl)-4-(2,2-dimethyl-1-aza-2-sila-1-cyclopentyl)pyrazole,N-(trimethylsilyl)-4-(2,2-diethyl-1-aza-2-sila-1-cyclopentyl)pyrazole,N-(trimethylsilyl)-4-(2,2-diphenyl-1-aza-2-sila-1-cyclopentyl)pyrazole,N-methyl-4-(2,2-dimethyl-1-aza-2-sila-1-cyclopentyl)imidazole,N-methyl-4-(2,2-diethyl-1-aza-2-sila-1-cyclopentyl)imidazole,N-methyl-4-(2,2-diphenyl-1-aza-2-sila-1-cyclopentyl)imidazole,N-(trimethylsilyl)-4-(2,2-dimethyl-1-aza-2-sila-1-cyclopentyl)imidazole,N-(trimethylsilyl)-4-(2,2-diethyl-1-aza-2-sila-1-cyclopentyl)imidazole,andN-(trimethylsilyl)-4-(2,2-diphenyl-1-aza-2-sila-1-cyclopentyl)imidazole.

As described above, the nitrogen heterocycle containing a pendantfunctional group is combined with a halosilane to thereby activate thenitrogen heterocycle. In one or more embodiments, the halosilane may bedefined by the formula VI:R_((4-n))SiX_(n)where each X is individually a halogen atom, each R is individually amonovalent organic group, and n is an integer from 1 to 4. In one ormore embodiments, each X is bromine. In other embodiments, each X ischlorine. In other embodiments, each X is iodine.

In one or more embodiments, where n is equal to 4 the halosilane offormula VI may be referred to as a tetrahalosilane. In one or moreembodiments, where n is equal to 3 and the R of formula VI is ahydrocarbyl group, the halosilane may be referred to as ahydrocarbyltrihalosilane. In one or more embodiments, where n is equalto 2 and each R of formula VI is a hydrocarbyl group, the halosilane maybe referred to as a dihydrocarbyldihalosilane. In one or moreembodiments, where n is equal to 1 and R of formula VI is a hydrocarbylgroup, the halosilane may be referred to as a trihydrocarbylhalosilane.In one or more embodiments, where n is equal to 3 and the R of formulaVI is a hydrocarbyloxy group, the halosilane may be referred to as ahydrocarbyloxytrihalosilane. In one or more embodiments, where n isequal to 2 and each R of formula VI is a hydrocarbyloxy group, thehalosilane may be referred to as a dihydrocarbyloxydihalosilane. In oneor more embodiments where n is equal to 1 and R of formula VI is ahydrocarbyloxy group, the halosilane may be referred to as atrihydrocarbyloxyhalosilane. In one or more embodiments, where n isequal to 2 and one R of formula VI is a hydrocarbyloxy group and one Ris a hydrocarbyl group, the halosilane may be referred to as ahydrocarbylhydrocarbyloxydihalosilane. In one or more embodiments wheren is equal to 1 and one R of formula VI is a hydrocarbyloxy group andtwo R's are hydrocarbyl groups, the halosilane may be referred to as adihydrocarbylhydrocarbyloxyhalosilane. In one or more embodiments wheren is equal to 1 and two R's of formula VI are hydrocarbyloxy groups andone R is a hydrocarbyl group, the halosilane may be referred to as ahydrocarbyldihydrocarbyloxyhalosilane.

Specific examples of tetrahalosilanes include silicon tetrachloride,silicon tetrabromide, silicon tetraiodide, silicon trichloride bromide,silicon trichloride iodide, silicon tribromide chloride, silicontribromide iodide, silicon triiodide chloride, silicon triiodidebromide, silicon dibromide dichloride, silicon diiodide dichloride,silicon diiodide dibromide, silicon bromide chloride diiodide, siliconiodide chloride dibromide, silicon iodide chloride bromide chloride, andsilicon bromide iodide dichloride.

Specific examples of hydrocarbyltrihalosilanes include phenyl trichlorosilane, trichloro hexyl silane, trichloro octyl silane, trichloro butylsilane, trichloro methyl silane, phenyl tribromo silane, tribromo hexylsilane, tribromo octyl silane, tribromo butyl silane, tribromo methylsilane, phenyl triiodo silane, triiodo hexyl silane, triiodo octylsilane, triiodo butyl silane, triiodo methyl silane, phenyl dibromochloro silane, dibromo chloro hexyl silane, dibromo chloro octyl silane,dibromo chloro butyl silane, dibromo chloro methyl silane, phenyl diiodochloro silane, diiodo chloro hexyl silane, diiodo chloro octyl silane,diiodo chloro butyl silane, diiodo chloro methyl silane, phenyl dichlorobromo silane, dichloro bromo hexyl silane, dichloro bromo octyl silane,dichloro bromo butyl silane, dichloro bromo methyl silane, phenyl diiodobromo silane, diiodo bromo hexyl silane, diiodo bromo octyl silane,diiodo bromo butyl silane, diiodo bromo methyl silane, phenyl dichloroiodo silane, dichloro iodo hexyl silane, dichloro iodo octyl silane,dichloro iodo butyl silane, dichloro iodo methyl silane, phenyl dibromoiodo silane, dibromo iodo hexyl silane, dibromo iodo octyl silane,dibromo iodo butyl silane, dibromo iodo methyl silane, phenyl iodochloro bromo silane, iodo chloro bromo hexyl silane, iodo chloro bromooctyl silane, iodo chloro bromo butyl silane, and iodo chloro bromomethyl silane.

Specific examples of dihydrocarbyldihalosilanes include diphenyldichloro silane, dihexyl dichloro silane, dioctyl dichloro silane,dibutyl dichloro silane, dimethyl dichloro silane, hexyl phenyl dichlorosilane, octyl phenyl dichloro silane, butyl phenyl dichloro silane,methyl phenyl dichloro silane, octyl hexyl dichloro silane, butyl hexyldichloro silane, methyl hexyl dichloro silane, butyl octyl dichlorosilane, methyl octyl dichloro silane, methyl butyl dichloro silane,diphenyl dibromo silane, dihexyl dibromo silane, dioctyl dibromo silane,dibutyl dibromo silane, dimethyl dibromo silane, hexyl phenyl dibromosilane, octyl phenyl dibromo silane, butyl phenyl dibromo silane, methylphenyl dibromo silane, octyl hexyl dibromo silane, butyl hexyl dibromosilane, methyl hexyl dibromo silane, butyl octyl dibromo silane, methyloctyl dibromo silane, methyl butyl dibromo silane, diphenyl diiodosilane, dihexyl diiodo silane, dioctyl diiodo silane, dibutyl diiodosilane, dimethyl diiodo silane, hexyl phenyl diiodo silane, octyl phenyldiiodo silane, butyl phenyl diiodo silane, methyl phenyl diiodo silane,octyl hexyl diiodo silane, butyl hexyl diiodo silane, methyl hexyldiiodo silane, butyl octyl diiodo silane, methyl octyl diiodo silane,methyl butyl diiodo silane, diphenyl bromo chloro silane, dihexyl bromochloro silane, dioctyl bromo chloro silane, dibutyl bromo chloro silane,dimethyl bromo chloro silane, hexyl phenyl bromo chloro silane, octylphenyl bromo chloro silane, butyl phenyl bromo chloro silane, methylphenyl bromo chloro silane, octyl hexyl bromo chloro silane, butyl hexylbromo chloro silane, methyl hexyl bromo chloro silane, butyl octyl bromochloro silane, methyl octyl bromo chloro silane, methyl butyl bromochloro silane, diphenyl iodo chloro silane, dihexyl iodo chloro silane,dioctyl iodo chloro silane, dibutyl iodo chloro silane, dimethyl iodochloro silane, hexyl phenyl iodo chloro silane, octyl phenyl iodo chlorosilane, butyl phenyl iodo chloro silane, methyl phenyl iodo chlorosilane, octyl hexyl iodo chloro silane, butyl hexyl iodo chloro silane,methyl hexyl iodo chloro silane, butyl octyl iodo chloro silane, methyloctyl iodo chloro silane, methyl butyl iodo chloro silane, diphenylbromo iodo silane, dihexyl bromo iodo silane, dioctyl bromo iodo silane,dibutyl bromo iodo silane, dimethyl bromo iodo silane, hexyl phenylbromo iodo silane, octyl phenyl bromo iodo silane, butyl phenyl bromoiodo silane, methyl phenyl bromo iodo silane, octyl hexyl bromo iodosilane, butyl hexyl bromo iodo silane, methyl hexyl bromo iodo silane,butyl octyl bromo iodo silane, methyl octyl bromo iodo silane, andmethyl butyl bromo iodo silane.

Specific examples of trihydrocarbylhalosilanes include triphenyl chlorosilane, trihexyl chloro silane, trioctyl chloro silane, tributyl chlorosilane, trimethyl chloro silane, triphenyl bromo silane, trihexyl bromosilane, trioctyl bromo silane, tributyl bromo silane, trimethyl bromosilane, triphenyl iodo silane, trihexyl iodo silane, trioctyl iodosilane, tributyl iodo silane, trimethyl iodo silane, hexyl diphenylchloro silane, octyl diphenyl chloro silane, butyl diphenyl chlorosilane, methyl diphenyl chloro silane, phenyl dihexyl chloro silane,octyl dihexyl chloro silane, butyl dihexyl chloro silane, methyl dihexylchloro silane, phenyl dioctyl chloro silane, hexyl dioctyl chlorosilane, butyl dioctyl chloro silane, methyl dioctyl chloro silane,phenyl dibutyl chloro silane, hexyl dibutyl chloro silane, octyl dibutylchloro silane, methyl dibutyl chloro silane, phenyl dimethyl chlorosilane, hexyl dimethyl chloro silane, octyl dimethyl chloro silane,butyl dimethyl chloro silane, hexyl diphenyl bromo silane, octyldiphenyl bromo silane, butyl diphenyl bromo silane, methyl diphenylbromo silane, phenyl dihexyl bromo silane, octyl dihexyl bromo silane,butyl dihexyl bromo silane, methyl dihexyl bromo silane, phenyl dioctylbromo silane, hexyl dioctyl bromo silane, butyl dioctyl bromo silane,methyl dioctyl bromo silane, phenyl dibutyl bromo silane, hexyl dibutylbromo silane, octyl dibutyl bromo silane, methyl dibutyl bromo silane,phenyl dimethyl bromo silane, hexyl dimethyl bromo silane, octyldimethyl bromo silane, butyl dimethyl bromo silane, hexyl diphenyl iodosilane, octyl diphenyl iodo silane, butyl diphenyl iodo silane, methyldiphenyl iodo silane, phenyl dihexyl iodo silane, octyl dihexyl iodosilane, butyl dihexyl iodo silane, methyl dihexyl iodo silane, phenyldioctyl iodo silane, hexyl dioctyl iodo silane, butyl dioctyl iodosilane, methyl dioctyl iodo silane, phenyl dibutyl iodo silane, hexyldibutyl iodo silane, octyl dibutyl iodo silane, methyl dibutyl iodosilane, phenyl dimethyl iodo silane, hexyl dimethyl iodo silane, octyldimethyl iodo silane, butyl dimethyl iodo silane, octyl hexyl phenylchloro silane, butyl hexyl phenyl chloro silane, methyl hexyl phenylchloro silane, butyl octyl phenyl chloro silane, methyl octyl phenylchloro silane, methyl butyl phenyl chloro silane, butyl octyl hexylchloro silane, methyl octyl hexyl chloro silane, methyl butyl hexylchloro silane, methyl butyl octyl chloro silane, octyl hexyl phenylbromo silane, butyl hexyl phenyl bromo silane, methyl hexyl phenyl bromosilane, butyl octyl phenyl bromo silane, methyl octyl phenyl bromosilane, methyl butyl phenyl bromo silane, butyl octyl hexyl bromosilane, methyl octyl hexyl bromo silane, methyl butyl hexyl bromosilane, methyl butyl octyl bromo silane, octyl hexyl phenyl iodo silane,butyl hexyl phenyl iodo silane, methyl hexyl phenyl iodo silane, butyloctyl phenyl iodo silane, methyl octyl phenyl iodo silane, methyl butylphenyl iodo silane, butyl octyl hexyl iodo silane, methyl octyl hexyliodo silane, methyl butyl hexyl iodo silane, and methyl butyl octyl iodosilane.

Specific examples of hydrocarbyloxytrihalosilanes include methoxytrichloro silane, ethoxy trichloro silane, propoxy trichloro silane,phenoxy trichloro silane, methoxy tribromo silane, ethoxy tribromosilane, propoxy tribromo silane, phenoxy tribromo silane, methoxytriiodo silane, ethoxy triiodo silane, propoxy triiodo silane, phenoxytriiodo silane, methoxy dibromo chloro silane, ethoxy dibromo chlorosilane, propoxy dibromo chloro silane, phenoxy dibromo chloro silane,methoxy diiodo chloro silane, ethoxy diiodo chloro silane, propoxydiiodo chloro silane, phenoxy diiodo chloro silane, methoxy dichlorobromo silane, ethoxy dichloro bromo silane, propoxy dichloro bromosilane, phenoxy dichloro bromo silane, methoxy diiodo bromo silane,ethoxy diiodo bromo silane, propoxy diiodo bromo silane, phenoxy diiodobromo silane, methoxy dichloro iodo silane, ethoxy dichloro iodo silane,propoxy dichloro iodo silane, phenoxy dichloro iodo silane, methoxydibromo iodo silane, ethoxy dibromo iodo silane, propoxy dibromo iodosilane, phenoxy dibromo iodo silane, methoxy iodo chloro bromo silane,ethoxy iodo chloro bromo silane, propoxy iodo chloro bromo silane, andphenoxy iodo chloro bromo silane.

Specific examples of dihydrocarbyloxydihalosilanes include dimethoxydichloro silane, diethoxy dichloro silane, dipropoxy dichloro silane,diphenoxy dichloro silane, ethoxy methoxy dichloro silane, propoxymethoxy dichloro silane, phenoxy methoxy dichloro silane, propoxy ethoxydichloro silane, phenoxy ethoxy dichloro silane, phenoxy propoxydichloro silane, dimethoxy dibromo silane, diethoxy dibromo silane,dipropoxy dibromo silane, diphenoxy dibromo silane, ethoxy methoxydibromo silane, propoxy methoxy dibromo silane, phenoxy methoxy dibromosilane, propoxy ethoxy dibromo silane, phenoxy ethoxy dibromo silane,phenoxy propoxy dibromo silane, dimethoxy diiodo silane, diethoxy diiodosilane, dipropoxy diiodo silane, diphenoxy diiodo silane, ethoxy methoxydiiodo silane, propoxy methoxy diiodo silane, phenoxy methoxy diiodosilane, propoxy ethoxy diiodo silane, phenoxy ethoxy diiodo silane,phenoxy propoxy diiodo silane, dimethoxy bromo chloro silane, diethoxybromo chloro silane, dipropoxy bromo chloro silane, diphenoxy bromochloro silane, ethoxy methoxy bromo chloro silane, propoxy methoxy bromochloro silane, phenoxy methoxy bromo chloro silane, propoxy ethoxy bromochloro silane, phenoxy ethoxy bromo chloro silane, phenoxy propoxy bromochloro silane, dimethoxy iodo chloro silane, diethoxy iodo chlorosilane, dipropoxy iodo chloro silane, diphenoxy iodo chloro silane,ethoxy methoxy iodo chloro silane, propoxy methoxy iodo chloro silane,phenoxy methoxy iodo chloro silane, propoxy ethoxy iodo chloro silane,phenoxy ethoxy iodo chloro silane, phenoxy propoxy iodo chloro silane,dimethoxy bromo iodo silane, diethoxy bromo iodo silane, dipropoxy bromoiodo silane, diphenoxy bromo iodo silane, ethoxy methoxy bromo iodosilane, propoxy methoxy bromo iodo silane, phenoxy methoxy bromo iodosilane, propoxy ethoxy bromo iodo silane, phenoxy ethoxy bromo iodosilane, and phenoxy propoxy bromo iodo silane.

Specific examples of trihydrocarbyloxyhalosilanes include trimethoxychloro silane, triethoxy chloro silane, tripropoxy chloro silane,triphenoxy chloro silane, trimethoxy bromo silane, triethoxy bromosilane, tripropoxy bromo silane, triphenoxy bromo silane, trimethoxyiodo silane, triethoxy iodo silane, tripropoxy iodo silane, triphenoxyiodo silane, trimethoxy chloro silane, triethoxy chloro silane,tripropoxy chloro silane, triphenoxy chloro silane, propoxy ethoxymethoxy chloro silane, phenoxy ethoxy methoxy chloro silane, phenoxypropoxy methoxy chloro silane, phenoxy propoxy ethoxy chloro silane,trimethoxy bromo silane, triethoxy bromo silane, tripropoxy bromosilane, triphenoxy bromo silane, propoxy ethoxy methoxy bromo silane,phenoxy ethoxy methoxy bromo silane, phenoxy propoxy methoxy bromosilane, phenoxy propoxy ethoxy bromo silane, trimethoxy iodo silane,triethoxy iodo silane, tripropoxy iodo silane, triphenoxy iodo silane,propoxy ethoxy methoxy iodo silane, phenoxy ethoxy methoxy iodo silane,phenoxy propoxy methoxy iodo silane, and phenoxy propoxy ethoxy iodosilane.

Specific examples of hydrocarbylhydrocarbyloxydihalosilanes includephenyl methoxy dichloro silane, phenyl ethoxy dichloro silane, phenylpropoxy dichloro silane, phenyl phenoxy dichloro silane, hexyl methoxydichloro silane, hexyl ethoxy dichloro silane, hexyl propoxy dichlorosilane, hexyl phenoxy dichloro silane, octyl methoxy dichloro silane,octyl ethoxy dichloro silane, octyl propoxy dichloro silane, octylphenoxy dichloro silane, butyl methoxy dichloro silane, butyl ethoxydichloro silane, butyl propoxy dichloro silane, butyl phenoxy dichlorosilane, methyl methoxy dichloro silane, methyl ethoxy dichloro silane,methyl propoxy dichloro silane, methyl phenoxy dichloro silane, phenylmethoxy dibromo silane, phenyl ethoxy dibromo silane, phenyl propoxydibromo silane, phenyl phenoxy dibromo silane, hexyl methoxy dibromosilane, hexyl ethoxy dibromo silane, hexyl propoxy dibromo silane, hexylphenoxy dibromo silane, octyl methoxy dibromo silane, octyl ethoxydibromo silane, octyl propoxy dibromo silane, octyl phenoxy dibromosilane, butyl methoxy dibromo silane, butyl ethoxy dibromo silane, butylpropoxy dibromo silane, butyl phenoxy dibromo silane, methyl methoxydibromo silane, methyl ethoxy dibromo silane, methyl propoxy dibromosilane, methyl phenoxy dibromo silane, phenyl methoxy diiodo silane,phenyl ethoxy diiodo silane, phenyl propoxy diiodo silane, phenylphenoxy diiodo silane, hexyl methoxy diiodo silane, hexyl ethoxy diiodosilane, hexyl propoxy diiodo silane, hexyl phenoxy diiodo silane, octylmethoxy diiodo silane, octyl ethoxy diiodo silane, octyl propoxy diiodosilane, octyl phenoxy diiodo silane, butyl methoxy diiodo silane, butylethoxy diiodo silane, butyl propoxy diiodo silane, butyl phenoxy diiodosilane, methyl methoxy diiodo silane, methyl ethoxy diiodo silane,methyl propoxy diiodo silane, methyl phenoxy diiodo silane, phenylmethoxy bromo chloro silane, phenyl ethoxy bromo chloro silane, phenylpropoxy bromo chloro silane, phenyl phenoxy bromo chloro silane, hexylmethoxy bromo chloro silane, hexyl ethoxy bromo chloro silane, hexylpropoxy bromo chloro silane, hexyl phenoxy bromo chloro silane, octylmethoxy bromo chloro silane, octyl ethoxy bromo chloro silane, octylpropoxy bromo chloro silane, octyl phenoxy bromo chloro silane, butylmethoxy bromo chloro silane, butyl ethoxy bromo chloro silane, butylpropoxy bromo chloro silane, butyl phenoxy bromo chloro silane, methylmethoxy bromo chloro silane, methyl ethoxy bromo chloro silane, methylpropoxy bromo chloro silane, methyl phenoxy bromo chloro silane, phenylmethoxy iodo chloro silane, phenyl ethoxy iodo chloro silane, phenylpropoxy iodo chloro silane, phenyl phenoxy iodo chloro silane, hexylmethoxy iodo chloro silane, hexyl ethoxy iodo chloro silane, hexylpropoxy iodo chloro silane, hexyl phenoxy iodo chloro silane, octylmethoxy iodo chloro silane, octyl ethoxy iodo chloro silane, octylpropoxy iodo chloro silane, octyl phenoxy iodo chloro silane, butylmethoxy iodo chloro silane, butyl ethoxy iodo chloro silane, butylpropoxy iodo chloro silane, butyl phenoxy iodo chloro silane, methylmethoxy iodo chloro silane, methyl ethoxy iodo chloro silane, methylpropoxy iodo chloro silane, methyl phenoxy iodo chloro silane, phenylmethoxy bromo iodo silane, phenyl ethoxy bromo iodo silane, phenylpropoxy bromo iodo silane, phenyl phenoxy bromo iodo silane, hexylmethoxy bromo iodo silane, hexyl ethoxy bromo iodo silane, hexyl propoxybromo iodo silane, hexyl phenoxy bromo iodo silane, octyl methoxy bromoiodo silane, octyl ethoxy bromo iodo silane, octyl propoxy bromo iodosilane, octyl phenoxy bromo iodo silane, butyl methoxy bromo iodosilane, butyl ethoxy bromo iodo silane, butyl propoxy bromo iodo silane,butyl phenoxy bromo iodo silane, methyl methoxy bromo iodo silane,methyl ethoxy bromo iodo silane, methyl propoxy bromo iodo silane, andmethyl phenoxy bromo iodo silane.

Specific examples of dihydrocarbylhydrocarbyloxyhalosilanes includediphenyl methoxy chloro silane, dihexyl methoxy chloro silane, dioctylmethoxy chloro silane, dibutyl methoxy chloro silane, dimethyl methoxychloro silane, hexyl phenyl methoxy chloro silane, octyl phenyl methoxychloro silane, butyl phenyl methoxy chloro silane, methyl phenyl methoxychloro silane, octyl hexyl methoxy chloro silane, butyl hexyl methoxychloro silane, methyl hexyl methoxy chloro silane, butyl octyl methoxychloro silane, methyl octyl methoxy chloro silane, methyl butyl methoxychloro silane, diphenyl ethoxy chloro silane, dihexyl ethoxy chlorosilane, dioctyl ethoxy chloro silane, dibutyl ethoxy chloro silane,dimethyl ethoxy chloro silane, hexyl phenyl ethoxy chloro silane, octylphenyl ethoxy chloro silane, butyl phenyl ethoxy chloro silane, methylphenyl ethoxy chloro silane, octyl hexyl ethoxy chloro silane, butylhexyl ethoxy chloro silane, methyl hexyl ethoxy chloro silane, butyloctyl ethoxy chloro silane, methyl octyl ethoxy chloro silane, methylbutyl ethoxy chloro silane, diphenyl propoxy chloro silane, dihexylpropoxy chloro silane, dioctyl propoxy chloro silane, dibutyl propoxychloro silane, dimethyl propoxy chloro silane, hexyl phenyl propoxychloro silane, octyl phenyl propoxy chloro silane, butyl phenyl propoxychloro silane, methyl phenyl propoxy chloro silane, octyl hexyl propoxychloro silane, butyl hexyl propoxy chloro silane, methyl hexyl propoxychloro silane, butyl octyl propoxy chloro silane, methyl octyl propoxychloro silane, methyl butyl propoxy chloro silane, diphenyl phenoxychloro silane, dihexyl phenoxy chloro silane, dioctyl phenoxy chlorosilane, dibutyl phenoxy chloro silane, dimethyl phenoxy chloro silane,hexyl phenyl phenoxy chloro silane, octyl phenyl phenoxy chloro silane,butyl phenyl phenoxy chloro silane, methyl phenyl phenoxy chloro silane,octyl hexyl phenoxy chloro silane, butyl hexyl phenoxy chloro silane,methyl hexyl phenoxy chloro silane, butyl octyl phenoxy chloro silane,methyl octyl phenoxy chloro silane, methyl butyl phenoxy chloro silane,diphenyl methoxy bromo silane, dihexyl methoxy bromo silane, dioctylmethoxy bromo silane, dibutyl methoxy bromo silane, dimethyl methoxybromo silane, hexyl phenyl methoxy bromo silane, octyl phenyl methoxybromo silane, butyl phenyl methoxy bromo silane, methyl phenyl methoxybromo silane, octyl hexyl methoxy bromo silane, butyl hexyl methoxybromo silane, methyl hexyl methoxy bromo silane, butyl octyl methoxybromo silane, methyl octyl methoxy bromo silane, methyl butyl methoxybromo silane, diphenyl ethoxy bromo silane, dihexyl ethoxy bromo silane,dioctyl ethoxy bromo silane, dibutyl ethoxy bromo silane, dimethylethoxy bromo silane, hexyl phenyl ethoxy bromo silane, octyl phenylethoxy bromo silane, butyl phenyl ethoxy bromo silane, methyl phenylethoxy bromo silane, octyl hexyl ethoxy bromo silane, butyl hexyl ethoxybromo silane, methyl hexyl ethoxy bromo silane, butyl octyl ethoxy bromosilane, methyl octyl ethoxy bromo silane, methyl butyl ethoxy bromosilane, diphenyl propoxy bromo silane, dihexyl propoxy bromo silane,dioctyl propoxy bromo silane, dibutyl propoxy bromo silane, dimethylpropoxy bromo silane, hexyl phenyl propoxy bromo silane, octyl phenylpropoxy bromo silane, butyl phenyl propoxy bromo silane, methyl phenylpropoxy bromo silane, octyl hexyl propoxy bromo silane, butyl hexylpropoxy bromo silane, methyl hexyl propoxy bromo silane, butyl octylpropoxy bromo silane, methyl octyl propoxy bromo silane, methyl butylpropoxy bromo silane, diphenyl phenoxy bromo silane, dihexyl phenoxybromo silane, dioctyl phenoxy bromo silane, dibutyl phenoxy bromosilane, dimethyl phenoxy bromo silane, hexyl phenyl phenoxy bromosilane, octyl phenyl phenoxy bromo silane, butyl phenyl phenoxy bromosilane, methyl phenyl phenoxy bromo silane, octyl hexyl phenoxy bromosilane, butyl hexyl phenoxy bromo silane, methyl hexyl phenoxy bromosilane, butyl octyl phenoxy bromo silane, methyl octyl phenoxy bromosilane, methyl butyl phenoxy bromo silane, diphenyl methoxy iodo silane,dihexyl methoxy iodo silane, dioctyl methoxy iodo silane, dibutylmethoxy iodo silane, dimethyl methoxy iodo silane, hexyl phenyl methoxyiodo silane, octyl phenyl methoxy iodo silane, butyl phenyl methoxy iodosilane, methyl phenyl methoxy iodo silane, octyl hexyl methoxy iodosilane, butyl hexyl methoxy iodo silane, methyl hexyl methoxy iodosilane, butyl octyl methoxy iodo silane, methyl octyl methoxy iodosilane, methyl butyl methoxy iodo silane, diphenyl ethoxy iodo silane,dihexyl ethoxy iodo silane, dioctyl ethoxy iodo silane, dibutyl ethoxyiodo silane, dimethyl ethoxy iodo silane, hexyl phenyl ethoxy iodosilane, octyl phenyl ethoxy iodo silane, butyl phenyl ethoxy iodosilane, methyl phenyl ethoxy iodo silane, octyl hexyl ethoxy iodosilane, butyl hexyl ethoxy iodo silane, methyl hexyl ethoxy iodo silane,butyl octyl ethoxy iodo silane, methyl octyl ethoxy iodo silane, methylbutyl ethoxy iodo silane, diphenyl propoxy iodo silane, dihexyl propoxyiodo silane, dioctyl propoxy iodo silane, dibutyl propoxy iodo silane,dimethyl propoxy iodo silane, hexyl phenyl propoxy iodo silane, octylphenyl propoxy iodo silane, butyl phenyl propoxy iodo silane, methylphenyl propoxy iodo silane, octyl hexyl propoxy iodo silane, butyl hexylpropoxy iodo silane, methyl hexyl propoxy iodo silane, butyl octylpropoxy iodo silane, methyl octyl propoxy iodo silane, methyl butylpropoxy iodo silane, diphenyl phenoxy iodo silane, dihexyl phenoxy iodosilane, dioctyl phenoxy iodo silane, dibutyl phenoxy iodo silane,dimethyl phenoxy iodo silane, hexyl phenyl phenoxy iodo silane, octylphenyl phenoxy iodo silane, butyl phenyl phenoxy iodo silane, methylphenyl phenoxy iodo silane, octyl hexyl phenoxy iodo silane, butyl hexylphenoxy iodo silane, methyl hexyl phenoxy iodo silane, butyl octylphenoxy iodo silane, methyl octyl phenoxy iodo silane, and methyl butylphenoxy iodo silane.

Specific examples of hydrocarbyldihydrocarbyloxyhalosilanes includephenyl dimethoxy chloro silane, phenyl diethoxy chloro silane, phenyldipropoxy chloro silane, phenyl diphenoxy chloro silane, phenyl ethoxymethoxy chloro silane, phenyl propoxy methoxy chloro silane, phenylphenoxy methoxy chloro silane, phenyl propoxy ethoxy chloro silane,phenyl phenoxy ethoxy chloro silane, phenyl phenoxy propoxy chlorosilane, hexyl dimethoxy chloro silane, hexyl diethoxy chloro silane,hexyl dipropoxy chloro silane, hexyl diphenoxy chloro silane, hexylethoxy methoxy chloro silane, hexyl propoxy methoxy chloro silane, hexylphenoxy methoxy chloro silane, hexyl propoxy ethoxy chloro silane, hexylphenoxy ethoxy chloro silane, hexyl phenoxy propoxy chloro silane, octyldimethoxy chloro silane, octyl diethoxy chloro silane, octyl dipropoxychloro silane, octyl diphenoxy chloro silane, octyl ethoxy methoxychloro silane, octyl propoxy methoxy chloro silane, octyl phenoxymethoxy chloro silane, octyl propoxy ethoxy chloro silane, octyl phenoxyethoxy chloro silane, octyl phenoxy propoxy chloro silane, butyldimethoxy chloro silane, butyl diethoxy chloro silane, butyl dipropoxychloro silane, butyl diphenoxy chloro silane, butyl ethoxy methoxychloro silane, butyl propoxy methoxy chloro silane, butyl phenoxymethoxy chloro silane, butyl propoxy ethoxy chloro silane, butyl phenoxyethoxy chloro silane, butyl phenoxy propoxy chloro silane, methyldimethoxy chloro silane, methyl diethoxy chloro silane, methyl dipropoxychloro silane, methyl diphenoxy chloro silane, methyl ethoxy methoxychloro silane, methyl propoxy methoxy chloro silane, methyl phenoxymethoxy chloro silane, methyl propoxy ethoxy chloro silane, methylphenoxy ethoxy chloro silane, methyl phenoxy propoxy chloro silane,phenyl dimethoxy bromo silane, phenyl diethoxy bromo silane, phenyldipropoxy bromo silane, phenyl diphenoxy bromo silane, phenyl ethoxymethoxy bromo silane, phenyl propoxy methoxy bromo silane, phenylphenoxy methoxy bromo silane, phenyl propoxy ethoxy bromo silane, phenylphenoxy ethoxy bromo silane, phenyl phenoxy propoxy bromo silane, hexyldimethoxy bromo silane, hexyl diethoxy bromo silane, hexyl dipropoxybromo silane, hexyl diphenoxy bromo silane, hexyl ethoxy methoxy bromosilane, hexyl propoxy methoxy bromo silane, hexyl phenoxy methoxy bromosilane, hexyl propoxy ethoxy bromo silane, hexyl phenoxy ethoxy bromosilane, hexyl phenoxy propoxy bromo silane, octyl dimethoxy bromosilane, octyl diethoxy bromo silane, octyl dipropoxy bromo silane, octyldiphenoxy bromo silane, octyl ethoxy methoxy bromo silane, octyl propoxymethoxy bromo silane, octyl phenoxy methoxy bromo silane, octyl propoxyethoxy bromo silane, octyl phenoxy ethoxy bromo silane, octyl phenoxypropoxy bromo silane, butyl dimethoxy bromo silane, butyl diethoxy bromosilane, butyl dipropoxy bromo silane, butyl diphenoxy bromo silane,butyl ethoxy methoxy bromo silane, butyl propoxy methoxy bromo silane,butyl phenoxy methoxy bromo silane, butyl propoxy ethoxy bromo silane,butyl phenoxy ethoxy bromo silane, butyl phenoxy propoxy bromo silane,methyl dimethoxy bromo silane, methyl diethoxy bromo silane, methyldipropoxy bromo silane, methyl diphenoxy bromo silane, methyl ethoxymethoxy bromo silane, methyl propoxy methoxy bromo silane, methylphenoxy methoxy bromo silane, methyl propoxy ethoxy bromo silane, methylphenoxy ethoxy bromo silane, methyl phenoxy propoxy bromo silane, phenyldimethoxy iodo silane, phenyl diethoxy iodo silane, phenyl dipropoxyiodo silane, phenyl diphenoxy iodo silane, phenyl ethoxy methoxy iodosilane, phenyl propoxy methoxy iodo silane, phenyl phenoxy methoxy iodosilane, phenyl propoxy ethoxy iodo silane, phenyl phenoxy ethoxy iodosilane, phenyl phenoxy propoxy iodo silane, hexyl dimethoxy iodo silane,hexyl diethoxy iodo silane, hexyl dipropoxy iodo silane, hexyl diphenoxyiodo silane, hexyl ethoxy methoxy iodo silane, hexyl propoxy methoxyiodo silane, hexyl phenoxy methoxy iodo silane, hexyl propoxy ethoxyiodo silane, hexyl phenoxy ethoxy iodo silane, hexyl phenoxy propoxyiodo silane, octyl dimethoxy iodo silane, octyl diethoxy iodo silane,octyl dipropoxy iodo silane, octyl diphenoxy iodo silane, octyl ethoxymethoxy iodo silane, octyl propoxy methoxy iodo silane, octyl phenoxymethoxy iodo silane, octyl propoxy ethoxy iodo silane, octyl phenoxyethoxy iodo silane, octyl phenoxy propoxy iodo silane, butyl dimethoxyiodo silane, butyl diethoxy iodo silane, butyl dipropoxy iodo silane,butyl diphenoxy iodo silane, butyl ethoxy methoxy iodo silane, butylpropoxy methoxy iodo silane, butyl phenoxy methoxy iodo silane, butylpropoxy ethoxy iodo silane, butyl phenoxy ethoxy iodo silane, butylphenoxy propoxy iodo silane, methyl dimethoxy iodo silane, methyldiethoxy iodo silane, methyl dipropoxy iodo silane, methyl diphenoxyiodo silane, methyl ethoxy methoxy iodo silane, methyl propoxy methoxyiodo silane, methyl phenoxy methoxy iodo silane, methyl propoxy ethoxyiodo silane, methyl phenoxy ethoxy iodo silane, and methyl phenoxypropoxy iodo silane.

The amount of the halosilane used to active the nitrogen heterocycle maybe described with reference to the nitrogen heterocycle. In one or moreembodiments, the amount of the halosilane may be described as the molarratio of the halogen atoms in the halosilane (i.e. the equivalence ofhalogen) to the nitrogen atoms in the nitrogen heterocycle group of thenitrogen heterocycle containing a pendant functional group, where thenitrogen atoms include a lone pair of electrons. In one or moreembodiments, the molar ratio of the halogen atoms in the halosilane tothe nitrogen atoms in the nitrogen heterocycle may be from about 0.1:1to about 1:1, in other embodiments from about 0.5:1 to about 0.99:1, andin other embodiments from about 0.8:1 to about 0.95:1.

The nitrogen heterocycles and the halosilane may be combined at atemperature lower than the boiling point of the halosilane compound. Inone or more embodiments, the nitrogen heterocycles and the halosilanemay be combined at a temperature from about −20° C. to about 80° C., inother embodiments from about 0° C. to about 50° C. and in still otherembodiments from about 15° C. to about 30° C.

In one or more embodiments, the product of the combination of thenitrogen heterocycles and the halosilane may be used withoutpurification. In these or other embodiments, the product of thecombination of the nitrogen heterocycle and the halosilane, and anysolvent if present, may be added to the polymerization mixture after thenitrogen heterocycle is activated.

In one or more embodiments, the nitrogen heterocycle is activated withthe halosilane before it is added to a reactive polymer. In these orother embodiments, the halosilane-activated nitrogen heterocycle may beaged prior to the addition to a reactive polymer. In one or moreembodiments, the halosilane-activated nitrogen heterocycle may be agedfor at least 1 minute, in other embodiments at least 1 hour, and inother embodiments at least 4 hours. In these or other embodiments, thehalosilane-activated nitrogen heterocycle may be aged for at most 24hours, in other embodiments at most 12 hours, and in other embodimentsat most 6 hours. In certain embodiments, the halosilane-activatednitrogen heterocycle may be aged for about 1 minute to about 24 hours,in other embodiments about 1 hour to about 12 hours, and in otherembodiments about 4 hours to about 6 hours.

The amount of the halosilane-activated nitrogen heterocycle that can beadded to the polymerization mixture to yield the functionalized polymerof this invention may depend on various factors including the type andamount of catalyst or initiator used to synthesize the reactive polymerand the desired degree of functionalization. In certain embodiments, theamount of the halosilane-activated nitrogen heterocycle added to thepolymerization mixture may be described in terms of the amount ofnitrogen heterocycle added regardless of the percentage of activation.In one or more embodiments, where the reactive polymer is prepared byemploying a lanthanide-based catalyst, the amount of the nitrogenheterocycle employed can be described with reference to the lanthanidemetal of the lanthanide-containing compound. For example, the molarratio of the nitrogen heterocycle to the lanthanide metal may be fromabout 1:1 to about 200:1, in other embodiments from about 5:1 to about150:1, and in other embodiments from about 10:1 to about 100:1.

In other embodiments, such as where the reactive polymer is prepared byusing an anionic initiator, the amount of the nitrogen heterocycleemployed can be described with reference to the amount of metal cationassociated with the initiator. For example, where an organolithiuminitiator is employed, the molar ratio of the nitrogen heterocycle tothe lithium cation may be from about 0.3:1 to about 2:1, in otherembodiments from about 0.6:1 to about 1.5:1, and in other embodimentsfrom 0.8:1 to about 1.2:1.

In one or more embodiments, in addition to the halosilane-activatednitrogen heterocycle, a co-functionalizing agent may also be added tothe polymerization mixture to yield a functionalized polymer withtailored properties. A mixture of two or more co-functionalizing agentsmay also be employed. The co-functionalizing agent may be added to thepolymerization mixture prior to, together with, or after theintroduction of the halosilane-activated nitrogen heterocycle. In one ormore embodiments, the co-functionalizing agent is added to thepolymerization mixture at least 5 minutes after, in other embodiments atleast 10 minutes after, and in other embodiments at least 30 minutesafter the introduction of the halosilane-activated nitrogen heterocycle.

In one or more embodiments, co-functionalizing agents include compoundsor reagents that can react with a reactive polymer produced by thisinvention and thereby provide the polymer with a functional group thatis distinct from a propagating chain that has not been reacted with theco-functionalizing agent. The functional group may be reactive orinteractive with other polymer chains (propagating and/ornon-propagating) or with other constituents such as reinforcing fillers(e.g. carbon black) that may be combined with the polymer. In one ormore embodiments, the reaction between the co-functionalizing agent andthe reactive polymer proceeds via an addition or substitution reaction.

Useful co-functionalizing agents may include compounds that simplyprovide a functional group at the end of a polymer chain without joiningtwo or more polymer chains together, as well as compounds that cancouple or join two or more polymer chains together via a functionallinkage to form a single macromolecule. The latter type ofco-functionalizing agents may also be referred to as coupling agents.

In one or more embodiments, co-functionalizing agents include compoundsthat will add or impart a heteroatom to the polymer chain. In particularembodiments, co-functionalizing agents include those compounds that willimpart a functional group to the polymer chain to form a functionalizedpolymer that reduces the 50° C. hysteresis loss of a carbon-black filledvulcanizates prepared from the functionalized polymer as compared tosimilar carbon-black filled vulcanizates prepared fromnon-functionalized polymer. In one or more embodiments, this reductionin hysteresis loss is at least 5%, in other embodiments at least 10%,and in other embodiments at least 15%.

In one or more embodiments, suitable co-functionalizing agents includethose compounds that contain groups that may react with the reactivepolymers produced in accordance with this invention. Exemplaryco-functionalizing agents include ketones, quinones, aldehydes, amides,esters, isocyanates, isothiocyanates, epoxides, imines, aminoketones,aminothioketones, and acid anhydrides. Examples of these compounds aredisclosed in U.S. Pat. Nos. 4,906,706, 4,990,573, 5,064,910, 5,567,784,5,844,050, 6,838,526, 6,977,281, and 6,992,147; U.S. Pat. PublicationNos. 2006/0004131 A1, 2006/0025539 A1, 2006/0030677 A1, and 2004/0147694A1; Japanese Patent Application Nos. 05-051406A, 05-059103A, 10-306113A,and 11-035633A; which are incorporated herein by reference. Otherexamples of co-functionalizing agents include azine compounds asdescribed in U.S. Pat. No. 7,879,952, hydrobenzamide compounds asdisclosed in U.S. Pat. No. 7,671,138, nitro compounds as disclosed inU.S. Pat. No. 7,732,534, and protected oxime compounds as disclosed inU.S. Pat. No. 8,088,868, all of which are incorporated herein byreference.

In particular embodiments, the co-functionalizing agents employed may bemetal halides, metalloid halides, alkoxysilanes, metal carboxylates,hydrocarbylmetal carboxylates, hydrocarbylmetal ester-carboxylates, andmetal alkoxides.

Exemplary metal halide compounds include tin tetrachloride, tintetrabromide, tin tetraiodide, n-butyltin trichloride, phenyltintrichloride, di-n-butyltin dichloride, diphenyltin dichloride,tri-n-butyltin chloride, triphenyltin chloride, germanium tetrachloride,germanium tetrabromide, germanium tetraiodide, n-butylgermaniumtrichloride, di-n-butylgermanium dichloride, and tri-n-butylgermaniumchloride.

Exemplary metalloid halide compounds include silicon tetrachloride,silicon tetrabromide, silicon tetraiodide, methyltrichlorosilane,phenyltrichlorosilane, dimethyldichlorosilane, diphenyldichlorosilane,boron trichloride, boron tribromide, boron triiodide, phosphoroustrichloride, phosphorous tribromide, and phosphorus triiodide.

In one or more embodiments, the alkoxysilanes may include at least onegroup selected from the group consisting of an epoxy group and anisocyanate group.

Exemplary alkoxysilane compounds including an epoxy group include(3-glycidyloxypropyl)trimethoxysilane,(3-glycidyloxypropyl)triethoxysilane,(3-glycidyloxypropyl)triphenoxysilane,(3-glycidyloxypropyl)methyldimethoxysilane,(3-glycidyloxypropyl)methyldiethoxysilane,(3-glycidyloxypropyl)methyldiphenoxysilane,[2-(3,4-epoxycyclohexyl)ethyl]trimethoxysilane, and[2-ethyl]triethoxysilane.

Exemplary alkoxysilane compounds including an isocyanate group include(3-isocyanatopropyl)trimethoxysilane,(3-isocyanatopropyl)triethoxysilane,(3-isocyanatopropyl)triphenoxysilane,(3-isocyanatopropyl)methyldimethoxysilane,(3-isocyanatopropyl)methyldiethoxysilane(3-isocyanatopropyl)methyldiphenoxysilane, and(isocyanatomethyl)methyldimethoxysilane.

Exemplary metal carboxylate compounds include tin tetraacetate, tinbis(2-ethylhexanaote), and tin bis(neodecanoate).

Exemplary hydrocarbylmetal carboxylate compounds include triphenyltin2-ethylhexanoate, tri-n-butyltin 2-ethylhexanoate, tri-n-butyltinneodecanoate, triisobutyltin 2-ethylhexanoate, diphenyltinbis(2-ethylhexanoate), di-n-butyltin bis(2-ethylhexanoate),di-n-butyltin bis(neodecanoate), phenyltin tris(2-ethylhexanoate), andn-butyltin tris(2-ethylhexanoate).

Exemplary hydrocarbylmetal ester-carboxylate compounds includedi-n-butyltin bis(n-octylmaleate), di-n-octyltin bis(n-octylmaleate),diphenyltin bis(n-octylmaleate), di-n-butyltin bis(2-ethylhexylmaleate),di-n-octyltin bis(2-ethylhexylmaleate), and diphenyltinbis(2-ethylhexylmaleate).

Exemplary metal alkoxide compounds include dimethoxytin, diethoxytin,tetraethoxytin, tetra-n-propoxytin, tetraisopropoxytin,tetra-n-butoxytin, tetraisobutoxytin, tetra-t-butoxytin, andtetraphenoxytin.

The amount of the co-functionalizing agent that can be added to thepolymerization mixture may depend on various factors including the typeand amount of catalyst or initiator used to synthesize the reactivepolymer and the desired degree of functionalization. In one or moreembodiments, where the reactive polymer is prepared by employing alanthanide-based catalyst, the amount of the co-functionalizing agentemployed can be described with reference to the lanthanide metal of thelanthanide-containing compound. For example, the molar ratio of theco-functionalizing agent to the lanthanide metal may be from about 1:1to about 200:1, in other embodiments from about 5:1 to about 150:1, andin other embodiments from about 10:1 to about 100:1.

In other embodiments, such as where the reactive polymer is prepared byusing an anionic initiator, the amount of the co-functionalizing agentemployed can be described with reference to the amount of metal cationassociated with the initiator. For example, where an organolithiuminitiator is employed, the molar ratio of the co-functionalizing agentto the lithium cation may be from about 0.3:1 to about 2:1, in otherembodiments from about 0.6:1 to about 1.5:1, and in other embodimentsfrom 0.8:1 to about 1.2:1.

The amount of the co-functionalizing agent employed can also bedescribed with reference to nitrogen heterocycle regardless of thepercentage of activation. In one or more embodiments, the molar ratio ofthe co-functionalizing agent to the nitrogen heterocycle may be fromabout 0.05:1 to about 1:1, in other embodiments from about 0.1:1 toabout 0.8:1, and in other embodiments from about 0.2:1 to about 0.6:1.

In one or more embodiments, the halosilane-activated nitrogenheterocycle (and optionally the co-functionalizing agent) may beintroduced to the polymerization mixture at a location (e.g., within avessel) where the polymerization has been conducted. In otherembodiments, the halosilane-activated nitrogen heterocycle may beintroduced to the polymerization mixture at a location that is distinctfrom where the polymerization has taken place. For example, thehalosilane-activated nitrogen heterocycle may be introduced to thepolymerization mixture in downstream vessels including downstreamreactors or tanks, in-line reactors or mixers, extruders, ordevolatilizers.

In one or more embodiments, the halosilane-activated nitrogenheterocycle (and optionally the co-functionalizing agent) can be reactedwith the reactive polymer after a desired monomer conversion is achievedbut before the polymerization mixture is quenched by a quenching agent.In one or more embodiments, the reaction between thehalosilane-activated nitrogen heterocycle and the reactive polymer maytake place within 30 minutes, in other embodiments within 5 minutes, andin other embodiments within one minute after the peak polymerizationtemperature is reached. In one or more embodiments, the reaction betweenthe halosilane-activated nitrogen heterocycle and the reactive polymercan occur once the peak polymerization temperature is reached. In otherembodiments, the reaction between the halosilane-activated nitrogenheterocycle and the reactive polymer can occur after the reactivepolymer has been stored. In one or more embodiments, the storage of thereactive polymer occurs at room temperature or below room temperatureunder an inert atmosphere. In one or more embodiments, the reactionbetween the halosilane-activated nitrogen heterocycle and the reactivepolymer may take place at a temperature from about 10° C. to about 150°C., and in other embodiments from about 20° C. to about 100° C. The timerequired for completing the reaction between the halosilane-activatednitrogen heterocycle and the reactive polymer depends on various factorssuch as the type and amount of the catalyst or initiator used to preparethe reactive polymer, the type and amount of the halosilane-activatednitrogen heterocycle, as well as the temperature at which thefunctionalization reaction is conducted. In one or more embodiments, thereaction between the halosilane-activated nitrogen heterocycle and thereactive polymer can be conducted for about 10 to 60 minutes.

In one or more embodiments, after the reaction between the reactivepolymer and the halosilane-activated nitrogen heterocycle (andoptionally the co-functionalizing agent) has been accomplished orcompleted, a quenching agent can be added to the polymerization mixturein order to protonate the reaction product between the reactive polymerand the halosilane-activated nitrogen heterocycle, inactivate anyresidual reactive polymer chains, and/or inactivate the catalyst orcatalyst components. The quenching agent may include a protic compound,which includes, but is not limited to, an alcohol, a carboxylic acid, aninorganic acid, water, or a mixture thereof. An antioxidant such as2,6-di-tert-butyl-4-methylphenol may be added along with, before, orafter the addition of the quenching agent. The amount of the antioxidantemployed may be in the range of 0.2% to 1% by weight of the polymerproduct. Additionally, the polymer product can be oil extended by addingan oil to the polymer, which may be in the form of a polymer cement orpolymer dissolved or suspended in monomer. Practice of the presentinvention does not limit the amount of oil that may be added, andtherefore conventional amounts may be added (e.g., 5-50 phr). Usefuloils or extenders that may be employed include, but are not limited to,aromatic oils, paraffinic oils, naphthenic oils, vegetable oils otherthan castor oils, low PCA oils including MES, TDAE, and SRAE, and heavynaphthenic oils.

Once the polymerization mixture has been quenched, the variousconstituents of the polymerization mixture may be recovered. In one ormore embodiments, the unreacted monomer can be recovered from thepolymerization mixture. For example, the monomer can be distilled fromthe polymerization mixture by using techniques known in the art. In oneor more embodiments, a devolatilizer may be employed to remove themonomer from the polymerization mixture. Once the monomer has beenremoved from the polymerization mixture, the monomer may be purified,stored, and/or recycled back to the polymerization process.

The polymer product may be recovered from the polymerization mixture byusing techniques known in the art. In one or more embodiments,desolventization and drying techniques may be used. For instance, thepolymer can be recovered by passing the polymerization mixture through aheated screw apparatus, such as a desolventizing extruder, in which thevolatile substances are removed by evaporation at appropriatetemperatures (e.g., about 100° C. to about 170° C.) and underatmospheric or sub-atmospheric pressure. This treatment serves to removeunreacted monomer as well as any low-boiling solvent. Alternatively, thepolymer can also be recovered by subjecting the polymerization mixtureto steam desolventization, followed by drying the resulting polymercrumbs in a hot air tunnel. The polymer can also be recovered bydirectly drying the polymerization mixture on a drum dryer.

The reactive polymer and the halosilane-activated nitrogen heterocycle(and optionally the co-functionalizing agent) are believed to react toproduce a novel functionalized polymer, wherein the residue of thehalosilane-activated nitrogen heterocycle is imparted to the end of thepolymer chain. It is believed that the reactive end of the polymer chainreacts with the halosilane-activated nitrogen heterocycle. Nonetheless,the exact chemical structure of the functionalized polymer produced inevery embodiment is not known with any great degree of certainty,particularly as the structure relates to the residue imparted to thepolymer chain end by the halosilane-activated nitrogen heterocycle andoptionally the co-functionalizing agent. Indeed, it is speculated thatthe structure of the functionalized polymer may depend upon variousfactors such as the conditions employed to prepare the reactive polymer(e.g., the type and amount of the catalyst or initiator) and theconditions employed to react the halosilane-activated nitrogenheterocycle (and optionally the co-functionalizing agent) with thereactive polymer (e.g., the types and amounts of halosilane-activatednitrogen heterocycle and the co-functionalizing agent). Thefunctionalized polymer resulting from the reaction between the reactivepolymer and the halosilane-activated nitrogen heterocycle can beprotonated or further modified.

In one or more embodiments, the functionalized polymers preparedaccording to this invention may contain unsaturation. In these or otherembodiments, the functionalized polymers are vulcanizable. In one ormore embodiments, the functionalized polymers can have a glasstransition temperature (T_(g)) that is less than 0° C., in otherembodiments less than −20° C., and in other embodiments less than −30°C. In one embodiment, these polymers may exhibit a single glasstransition temperature. In particular embodiments, the polymers may behydrogenated or partially hydrogenated.

In one or more embodiments, the functionalized polymers of thisinvention may be cis-1,4-polydienes having a cis-1,4-linkage contentthat is greater than 60%, in other embodiments greater than about 75%,in other embodiments greater than about 90%, and in other embodimentsgreater than about 95%, where the percentages are based upon the numberof diene mer units adopting the cis-1,4 linkage versus the total numberof diene mer units. Also, these polymers may have a 1,2-linkage contentthat is less than about 7%, in other embodiments less than 5%, in otherembodiments less than 2%, and in other embodiments less than 1%, wherethe percentages are based upon the number of diene mer units adoptingthe 1,2-linkage versus the total number of diene mer units. The balanceof the diene mer units may adopt the trans-1,4-linkage. The cis-1,4-,1,2-, and trans-1,4-linkage contents can be determined by infraredspectroscopy. The number average molecular weight (M_(n)) of thesepolymers may be from about 1,000 to about 1,000,000, in otherembodiments from about 5,000 to about 200,000, in other embodiments fromabout 25,000 to about 150,000, and in other embodiments from about50,000 to about 120,000, as determined by using gel permeationchromatography (GPC) calibrated with polystyrene standards andMark-Houwink constants for the polymer in question. The molecular weightdistribution or polydispersity (M_(w)/M_(n)) of these polymers may befrom about 1.5 to about 5.0, and in other embodiments from about 2.0 toabout 4.0.

In one or more embodiments, the functionalized polymers of thisinvention may be polydienes having medium or low cis-1,4-linkagecontents. These polymers, which can be prepared by anionicpolymerization techniques, can have a cis-1,4-linkage content of fromabout 10% to 60%, in other embodiments from about 15% to 55%, and inother embodiments from about 20% to about 50%. These polydienes may alsohave a 1,2-linkage content from about 10% to about 90%, in otherembodiments from about 10% to about 60%, in other embodiments from about15% to about 50%, and in other embodiments from about 20% to about 45%.In particular embodiments, where the polydienes are prepared byemploying a functional anionic initiator, the head of the polymer chainincludes a functional group that is the residue of the functionalinitiator.

In particular embodiments, the functionalized polymers of this inventionare copolymers of 1,3-butadiene, styrene, and optionally isoprene. Thesemay include random copolymers and block copolymers.

Advantageously, the functionalized polymers of this invention mayprovide rubber compositions that demonstrate reduced hysteresis. Thefunctionalized polymers are particularly useful in preparing rubbercompositions that can be used to manufacture tire components. Rubbercompounding techniques and the additives employed therein are generallydisclosed in The Compounding and Vulcanization of Rubber, in RubberTechnology (2^(nd) Ed. 1973).

The rubber compositions can be prepared by using the functionalizedpolymers alone or together with other elastomers (i.e., polymers thatcan be vulcanized to form compositions possessing rubbery or elastomericproperties). Other elastomers that may be used include natural andsynthetic rubbers. The synthetic rubbers typically derive from thepolymerization of conjugated diene monomer, the copolymerization ofconjugated diene monomer with other monomer such as vinyl-substitutedaromatic monomer, or the copolymerization of ethylene with one or moreα-olefins and optionally one or more diene monomers.

Exemplary elastomers include natural rubber, synthetic polyisoprene,polybutadiene, polyisobutylene-co-isoprene, neoprene,poly(ethylene-co-propylene), poly(styrene-co-butadiene),poly(styrene-co-isoprene), poly(styrene-co-isoprene-co-butadiene),poly(isoprene-co-butadiene), poly(ethylene-co-propylene-co-diene),polysulfide rubber, acrylic rubber, urethane rubber, silicone rubber,epichlorohydrin rubber, and mixtures thereof. These elastomers can havea myriad of macromolecular structures including linear, branched, andstar-shaped structures.

The rubber compositions may include fillers such as inorganic andorganic fillers. Examples of organic fillers include carbon black andstarch. Examples of inorganic fillers include silica, aluminumhydroxide, magnesium hydroxide, mica, talc (hydrated magnesiumsilicate), and clays (hydrated aluminum silicates). Carbon blacks andsilicas are the most common fillers used in manufacturing tires. Incertain embodiments, a mixture of different fillers may beadvantageously employed.

In one or more embodiments, carbon blacks include furnace blacks,channel blacks, and lamp blacks. More specific examples of carbon blacksinclude super abrasion furnace blacks, intermediate super abrasionfurnace blacks, high abrasion furnace blacks, fast extrusion furnaceblacks, fine furnace blacks, semi-reinforcing furnace blacks, mediumprocessing channel blacks, hard processing channel blacks, conductingchannel blacks, and acetylene blacks.

In particular embodiments, the carbon blacks may have a surface area(EMSA) of at least 20 m²/g and in other embodiments at least 35 m²/g;surface area values can be determined by ASTM D-1765 using thecetyltrimethylammonium bromide (CTAS) technique. The carbon blacks maybe in a pelletized form or an unpelletized flocculent form. Thepreferred form of carbon black may depend upon the type of mixingequipment used to mix the rubber compound.

The amount of carbon black employed in the rubber compositions can be upto about 50 parts by weight per 100 parts by weight of rubber (phr),with about 5 to about 40 phr being typical.

Some commercially available silicas which may be used include Hi-Sil™215, Hi-Sil™ 233, and Hi-Sil™ 190 (PPG Industries, Inc.; Pittsburgh,Pa.). Other suppliers of commercially available silica include GraceDavison (Baltimore, Md.), Degussa Corp. (Parsippany, N.J.), RhodiaSilica Systems (Cranbury, N.J.), and J. M. Huber Corp. (Edison, N.J.).

In one or more embodiments, silicas may be characterized by theirsurface areas, which give a measure of their reinforcing character. TheBrunauer, Emmet and Teller (“BET”) method (described in J. Am. Chem.Soc., vol. 60, p. 309 et seq.) is a recognized method for determiningthe surface area. The BET surface area of silica is generally less than450 m²/g. Useful ranges of surface area include from about 32 to about400 m²/g, about 100 to about 250 m²/g, and about 150 to about 220 m²/g.

The pH's of the silicas are generally from about 5 to about 7 orslightly over 7, or in other embodiments from about 5.5 to about 6.8.

In one or more embodiments, where silica is employed as a filler (aloneor in combination with other fillers), a coupling agent and/or ashielding agent may be added to the rubber compositions during mixing inorder to enhance the interaction of silica with the elastomers. Usefulcoupling agents and shielding agents are disclosed in U.S. Pat. Nos.3,842,111, 3,873,489, 3,978,103, 3,997,581, 4,002,594, 5,580,919,5,583,245, 5,663,396, 5,674,932, 5,684,171, 5,684,172 5,696,197,6,608,145, 6,667,362, 6,579,949, 6,590,017, 6,525,118, 6,342,552, and6,683,135, which are incorporated herein by reference.

The amount of silica employed in the rubber compositions can be fromabout 1 to about 100 phr or in other embodiments from about 5 to about80 phr. The useful upper range is limited by the high viscosity impartedby silicas. When silica is used together with carbon black, the amountof silica can be decreased to as low as about 1 phr; as the amount ofsilica is decreased, lesser amounts of coupling agents and shieldingagents can be employed. Generally, the amounts of coupling agents andshielding agents range from about 4% to about 20% based on the weight ofsilica used.

A multitude of rubber curing agents (also called vulcanizing agents) maybe employed, including sulfur or peroxide-based curing systems. Curingagents are described in Kirk-Othmer, ENCYCLOPEDIA OF CHEMICALTECHNOLOGY, Vol. 20, pgs. 365-468, (3^(rd) Ed. 1982), particularlyVulcanization Agents and Auxiliary Materials, pgs. 390-402, and A. Y.Coran, Vulcanization, ENCYCLOPEDIA OF POLYMER SCIENCE AND ENGINEERING,(2^(nd) Ed. 1989), which are incorporated herein by reference.Vulcanizing agents may be used alone or in combination.

Other ingredients that are typically employed in rubber compounding mayalso be added to the rubber compositions. These include accelerators,accelerator activators, oils, plasticizer, waxes, scorch inhibitingagents, processing aids, zinc oxide, tackifying resins, reinforcingresins, fatty acids such as stearic acid, peptizers, and antidegradantssuch as antioxidants and antiozonants. In particular embodiments, theoils that are employed include those conventionally used as extenderoils, which are described above.

All ingredients of the rubber compositions can be mixed with standardmixing equipment such as Banbury or Brabender mixers, extruders,kneaders, and two-rolled mills. In one or more embodiments, theingredients are mixed in two or more stages. In the first stage (oftenreferred to as the masterbatch mixing stage), a so-called masterbatch,which typically includes the rubber component and filler, is prepared.To prevent premature vulcanization (also known as scorch), themasterbatch may exclude vulcanizing agents. The masterbatch may be mixedat a starting temperature of from about 25° C. to about 125° C. with adischarge temperature of about 135° C. to about 180° C. Once themasterbatch is prepared, the vulcanizing agents may be introduced andmixed into the masterbatch in a final mixing stage, which is typicallyconducted at relatively low temperatures so as to reduce the chances ofpremature vulcanization. Optionally, additional mixing stages, sometimescalled remills, can be employed between the masterbatch mixing stage andthe final mixing stage. One or more remill stages are often employedwhere the rubber composition includes silica as the filler. Variousingredients including the functionalized polymers of this invention canbe added during these remills.

The mixing procedures and conditions particularly applicable tosilica-filled tire formulations are described in U.S. Pat. Nos.5,227,425, 5,719,207, and 5,717,022, as well as European Patent No.890,606, all of which are incorporated herein by reference. In oneembodiment, the initial masterbatch is prepared by including thefunctionalized polymer of this invention and silica in the substantialabsence of coupling agents and shielding agents.

The rubber compositions prepared from the functionalized polymers ofthis invention are particularly useful for forming tire components suchas treads, subtreads, sidewalls, body ply skims, bead filler, and thelike. Preferably, the functional polymers of this invention are employedin tread and sidewall formulations. In one or more embodiments, thesetread or sidewall formulations may include from about 10% to about 100%by weight, in other embodiments from about 35% to about 90% by weight,and in other embodiments from about 50% to about 80% by weight of thefunctionalized polymer based on the total weight of the rubber withinthe formulation.

Where the rubber compositions are employed in the manufacture of tires,these compositions can be processed into tire components according toordinary tire manufacturing techniques including standard rubbershaping, molding and curing techniques. Typically, vulcanization iseffected by heating the vulcanizable composition in a mold; e.g., it maybe heated to about 140° C. to about 180° C. Cured or crosslinked rubbercompositions may be referred to as vulcanizates, which generally containthree-dimensional polymeric networks that are thermoset. The otheringredients, such as fillers and processing aids, may be evenlydispersed throughout the crosslinked network. Pneumatic tires can bemade as discussed in U.S. Pat. Nos. 5,866,171, 5,876,527, 5,931,211, and5,971,046, which are incorporated herein by reference.

In order to demonstrate the practice of the present invention, thefollowing examples have been prepared and tested. The examples shouldnot, however, be viewed as limiting the scope of the invention. Theclaims will serve to define the invention.

EXAMPLES Example 1 Synthesis of a Functionalizing Agent by Combining2-Cyanopyridine with Me₃SiCl

2-Cyanopyridine (2.0 g, 19.2 mmol) was transferred into a dry nitrogenpurged vessel and dry toluene (34.1 mL) was subsequently added. Themixture was agitated to go to complete dilution of the solid2-cyanopyridine, after which an equimolar amount freshly distilledchlorotrimethylsilane (2.44 mL, 19.2 mmol) was added at roomtemperature. The resulting mixture was used without purification inpreparing functionalized polymer. All other functionalizing agents wereprepared in an analogous fashion, except the molar ratio of2-cyanopyridine to the chlorosilane was adjusted based on the number ofchloride atoms in the chlorosilane.

Example 2 Synthesis of Unmodified cis-1,4-Polybutadiene

To 8-L stainless steel reactor, equipped with turbine agitator bladeswas added 1.46 kg hexanes, 2.37 kg of 21.2 wt % butadiene in hexanes andthe resulting mixture was then warmed to 26° C. Meanwhile, a preformedcatalyst was prepared by mixing 7.35 ml of 4.32 M methylaluminoxane intoluene, 1.62 g of 21.2 wt % 1,3-butadiene in hexane, 0.59 ml of 0.537 Mneodymium versatate in cyclohexane, 6.67 ml of 1.0 M diisobutylaluminumhydride in hexane, and 1.19 ml of 1.07 M diethylaluminum chloride inhexane. The catalyst was aged for 15 minutes and charged into thereactor. The reactor jacket temperature was then set to 65° C. About 60minutes after addition of the catalyst, the polymerization mixture wascooled to room temperature and quenched with 30 ml of 12 wt %2,6-di-tert-butyl-4-methylphenol solution in isopropanol. The resultingpolymer cement was coagulated with 12 liters of isopropanol containing 5g of 2,6-di-tert-butyl-4-methylphenol and then drum-dried. The Mooneyviscosity (ML₁₊₄) of the resulting polymer was determined to be 24.8 at100° C. by using an Alpha Technologies Mooney viscometer with a largerotor, a one-minute warm-up time, and a four-minute running time. Asdetermined by gel permeation chromatography (GPC), the polymer had anumber average molecular weight (M_(n)) of 108,100, a weight averagemolecular weight (M_(w)) of 193,400, and a molecular weight distribution(M_(w)/M_(n)) of 1.79. The infrared spectroscopic analysis of thepolymer indicated a cis-1,4-linkage content of 95.2%, atrans-1,4-linkage content of 4.2%, and a 1,2-linkage content of 0.6%.The properties of the resulting polymer are summarized in Table 1.

TABLE 1 Physical Properties of cis-1,4-Polybutadiene Example No. Example2 Example 3 Example 4 Example 5 Example 6 Example 7 Polymer unmodifiedunmodified 2-cyanopyridine 2-cyanopyridine 2-cyanopyridine2-cyanopyridine type and Me₃SiCl and Me₂SiCl₂ and MeSiCl₃ and SiCl₄ML₁₊₄ at 24.8 47.3 42.9 38.6 39.3 34.3 100° C. M_(n) 108,100 141,10091,700 93,600 99,600 100,600 M_(w) 193,400 225,100 194,400 206,400187,300 213,800 M_(w)/M_(n) 1.79 1.74 2.12 2.20 1.88 2.12 % cis-1,4-95.2 97.2 95.2 95.1 95.1 95.1 linkage % trans- 4.2 2.2 4.2 4.3 4.3 4.31,4- linkage % 1,2- 0.6 0.6 0.6 0.6 0.6 0.6 linkage

Example 3 Synthesis of Unmodified cis-1,4-Polybutadiene

To 8-L stainless steel reactor, equipped with turbine agitator bladeswas added 1.46 kg hexanes, 2.37 kg of 21.2 wt % butadiene in hexanes andthe resulting mixture was then warmed to 26° C. Meanwhile, a preformedcatalyst was prepared by mixing 7.35 ml of 4.32 M methylaluminoxane intoluene, 1.52 g of 22.5 wt % 1,3-butadiene in hexane, 0.59 ml of 0.537 Mneodymium versatate in cyclohexane, 6.67 ml of 1.0 M diisobutylaluminumhydride in hexane, and 1.27 ml of 1.0 M diethylaluminum chloride inhexane. The catalyst was aged for 15 minutes and charged into thereactor. The reactor jacket temperature was then set to 65° C. About 60minutes after addition of the catalyst, the polymerization mixture wascooled to room temperature and quenched with 30 ml of 12 wt %2,6-di-tert-butyl-4-methylphenol solution in isopropanol. The resultingpolymer cement was coagulated with 12 liters of isopropanol containing 5g of 2,6-di-tert-butyl-4-methylphenol and then drum-dried. The Mooneyviscosity (ML₁₊₄) of the resulting polymer was determined to be 47.3 at100° C. by using an Alpha Technologies Mooney viscometer with a largerotor, a one-minute warm-up time, and a four-minute running time. Asdetermined by gel permeation chromatography (GPC), the polymer had anumber average molecular weight (M_(n)) of 141,100, a weight averagemolecular weight (M_(w)) of 225,100, and a molecular weight distribution(M_(w)/M_(n)) of 1.74. The infrared spectroscopic analysis of thepolymer indicated a cis-1,4-linkage content of 97.2%, atrans-1,4-linkage content of 2.2%, and a 1,2-linkage content of 0.6%.The properties of the resulting polymer are summarized in Table 1.

Example 4 Synthesis of cis-1,4-Polybutadiene Modified with2-Cyanopyridine and Me₃SiCl

To 8-L stainless steel reactor, equipped with turbine agitator bladeswas added 1.46 kg hexanes, 2.37 kg of 21.2 wt % butadiene in hexanes andthe resulting mixture was then warmed to 26° C. Meanwhile, a preformedcatalyst was prepared by mixing 7.35 ml of 4.32 M methylaluminoxane intoluene, 1.52 g of 22.5 wt % 1,3-butadiene in hexane, 0.59 ml of 0.537 Mneodymium versatate in cyclohexane, 6.67 ml of 1.0 M diisobutylaluminumhydride in hexane, and 1.27 ml of 1.0 M diethylaluminum chloride inhexane. The catalyst was aged for 15 minutes and charged into thereactor. The reactor jacket temperature was then set to 65° C. About 60minutes after addition of the catalyst, the polymerization mixture wascooled to room temperature. After the mixture had cooled, c.a. 406 g ofthe resulting unmodified polymer cement (i.e., pseudo-living polymercement) was transferred from the reactor to a nitrogen-purged bottle,followed by addition of 4.55 ml of 0.5 M 2-cyanopyridine and Me₃SiCl(1:1 molar ratio) in toluene which was prepared in Example 1. The bottlewas tumbled for 30 minutes in a water bath maintained at 65° C. After 30minutes the cement was quenched with 30 ml of 12 wt %2,6-di-tert-butyl-4-methylphenol solution in isopropanol. The resultingpolymer cement was coagulated with 12 liters of isopropanol containing 5g of 2,6-di-tert-butyl-4-methylphenol and then drum-dried. The Mooneyviscosity (ML₁₊₄) of the resulting polymer was determined to be 42.9 at100° C. by using an Alpha Technologies Mooney viscometer with a largerotor, a one-minute warm-up time, and a four-minute running time. Asdetermined by gel permeation chromatography (GPC), the polymer had anumber average molecular weight (M_(n)) of 91,700, a weight averagemolecular weight (M_(w)) of 194,400, and a molecular weight distribution(M_(w)/M_(n)) of 2.12. The infrared spectroscopic analysis of thepolymer indicated a cis-1,4-linkage content of 95.2%, atrans-1,4-linkage content of 4.2%, and a 1,2-linkage content of 0.6%.The properties of the resulting polymer are summarized in Table 1.

Example 5 Synthesis of cis-1,4-Polybutadiene Modified with2-Cyanopyridine and Me₂SiCl₂

To 8-L stainless steel reactor, equipped with turbine agitator bladeswas added 1.46 kg hexanes, 2.37 kg of 21.2 wt % butadiene in hexanes andthe resulting mixture was then warmed to 26° C. Meanwhile, a preformedcatalyst was prepared by mixing 7.35 ml of 4.32 M methylaluminoxane intoluene, 1.52 g of 22.5 wt % 1,3-butadiene in hexane, 0.59 ml of 0.537 Mneodymium versatate in cyclohexane, 6.67 ml of 1.0 M diisobutylaluminumhydride in hexane, and 1.27 ml of 1.0 M diethylaluminum chloride inhexane. The catalyst was aged for 15 minutes and charged into thereactor. The reactor jacket temperature was then set to 65° C. About 60minutes after addition of the catalyst, the polymerization mixture wascooled to room temperature. After the mixture had cooled, c.a. 409 g ofthe resulting unmodified polymer cement (i.e., pseudo-living polymercement) was transferred from the reactor to a nitrogen-purged bottle,followed by addition of 4.59 ml of 0.5 M 2-cyanopyridine and Me₂SiCl₂(2:1 molar ratio) in toluene. The bottle was tumbled for 30 minutes in awater bath maintained at 65° C. After 30 minutes the cement was quenchedwith 30 ml of 12 wt % 2,6-di-tert-butyl-4-methylphenol solution inisopropanol. The resulting polymer cement was coagulated with 12 litersof isopropanol containing 5 g of 2,6-di-tert-butyl-4-methylphenol andthen drum-dried. The Mooney viscosity (ML₁₊₄) of the resulting polymerwas determined to be 38.6 at 100° C. by using an Alpha TechnologiesMooney viscometer with a large rotor, a one-minute warm-up time, and afour-minute running time. As determined by gel permeation chromatography(GPC), the polymer had a number average molecular weight (M_(n)) of93,600, a weight average molecular weight (M_(w)) of 206,400, and amolecular weight distribution (M_(w)/M_(n)) of 2.02. The infraredspectroscopic analysis of the polymer indicated a cis-1,4-linkagecontent of 95.1%, a trans-1,4-linkage content of 4.3%, and a 1,2-linkagecontent of 0.6%. The properties of the resulting polymer are summarizedin Table 1.

Example 6 Synthesis of cis-1,4-Polybutadiene Modified with2-Cyanopyridine and MeSiCl₃

To 8-L stainless steel reactor, equipped with turbine agitator bladeswas added 1.46 kg hexanes, 2.37 kg of 21.2 wt % butadiene in hexanes andthe resulting mixture was then warmed to 26° C. Meanwhile, a preformedcatalyst was prepared by mixing 7.35 ml of 4.32 M methylaluminoxane intoluene, 1.52 g of 22.5 wt % 1,3-butadiene in hexane, 0.59 ml of 0.537 Mneodymium versatate in cyclohexane, 6.67 ml of 1.0 M diisobutylaluminumhydride in hexane, and 1.27 ml of 1.0 M diethylaluminum chloride inhexane. The catalyst was aged for 15 minutes and charged into thereactor. The reactor jacket temperature was then set to 65° C. About 60minutes after addition of the catalyst, the polymerization mixture wascooled to room temperature. After the mixture had cooled, c.a. 411 g ofthe resulting unmodified polymer cement (i.e., pseudo-living polymercement) was transferred from the reactor to a nitrogen-purged bottle,followed by addition of 4.61 ml of 0.5 M 2-cyanopyridine and MeSiCl₃(3:1 molar ratio) in toluene. The bottle was tumbled for 30 minutes in awater bath maintained at 65° C. After 30 minutes the cement was quenchedwith 30 ml of 12 wt % 2,6-di-tert-butyl-4-methylphenol solution inisopropanol. The resulting polymer cement was coagulated with 12 litersof isopropanol containing 5 g of 2,6-di-tert-butyl-4-methylphenol andthen drum-dried. The Mooney viscosity (ML₁₊₄) of the resulting polymerwas determined to be 39.3 at 100° C. by using an Alpha TechnologiesMooney viscometer with a large rotor, a one-minute warm-up time, and afour-minute running time. As determined by gel permeation chromatography(GPC), the polymer had a number average molecular weight (M_(n)) of99,600, a weight average molecular weight (M_(w)) of 187,300, and amolecular weight distribution (M_(w)/M_(n)) of 1.88. The infraredspectroscopic analysis of the polymer indicated a cis-1,4-linkagecontent of 95.1%, a trans-1,4-linkage content of 4.3%, and a 1,2-linkagecontent of 0.6%. The properties of the resulting polymer are summarizedin Table 1.

Example 7 Synthesis of cis-1,4-Polybutadiene Modified with2-Cyanopyridine and SiCl₄

To 8-L stainless steel reactor, equipped with turbine agitator bladeswas added 1.46 kg hexanes, 2.37 kg of 21.2 wt % butadiene in hexanes andthe resulting mixture was then warmed to 26° C. Meanwhile, a preformedcatalyst was prepared by mixing 7.35 ml of 4.32 M methylaluminoxane intoluene, 1.52 g of 22.5 wt % 1,3-butadiene in hexane, 0.59 ml of 0.537 Mneodymium versatate in cyclohexane, 6.67 ml of 1.0 M diisobutylaluminumhydride in hexane, and 1.27 ml of 1.0 M diethylaluminum chloride inhexane. The catalyst was aged for 15 minutes and charged into thereactor. The reactor jacket temperature was then set to 65° C. About 60minutes after addition of the catalyst, the polymerization mixture wascooled to room temperature. After the mixture had cooled, c.a. 409 g ofthe resulting unmodified polymer cement (i.e., pseudo-living polymercement) was transferred from the reactor to a nitrogen-purged bottle,followed by addition of 4.58 ml of 0.5 M 2-cyanopyridine and SiCl₄ (4:1molar ratio) in toluene. The bottle was tumbled for 30 minutes in awater bath maintained at 65° C. After 30 minutes the cement was quenchedwith 30 ml of 12 wt % 2,6-di-tert-butyl-4-methylphenol solution inisopropanol. The resulting polymer cement was coagulated with 12 litersof isopropanol containing 5 g of 2,6-di-tert-butyl-4-methylphenol andthen drum-dried. The Mooney viscosity (ML₁₊₄) of the resulting polymerwas determined to be 34.3 at 100° C. by using an Alpha TechnologiesMooney viscometer with a large rotor, a one-minute warm-up time, and afour-minute running time. As determined by gel permeation chromatography(GPC), the polymer had a number average molecular weight (M_(n)) of100,600, a weight average molecular weight (M_(w)) of 213,800, and amolecular weight distribution (M_(w)/M_(n)) of 2.12. The infraredspectroscopic analysis of the polymer indicated a cis-1,4-linkagecontent of 95.1%, a trans-1,4-linkage content of 4.3%, and a 1,2-linkagecontent of 0.6%. The properties of the resulting polymer are summarizedin Table 1.

Compounding Evaluation of cis-1,4-Polybutadiene Modified with Activated2-Cyanopyridines vs. Unmodified cis-1,4-Polybutadiene

The cis-1,4-polybutadiene samples produced in Examples 2-7 wereevaluated in a rubber compound filled with carbon black. Thecompositions of the vulcanizates are presented in Table 2, wherein thenumbers are expressed as parts by weight per hundred parts by weight oftotal rubber (phr).

TABLE 2 Compositions of Rubber Vulcanizates Prepared fromcis-1,4-Polybutadiene Ingredient Amount (phr) cis-1,4-Polybutadienesample 80 Polyisoprene 20 HAF Carbon black 50 Oil 10 Wax 2 Antioxidant 1Zinc oxide 2.5 Stearic acid 2 Accelerators 1.3 Sulfur 1.5 Total 170.3

The Mooney viscosity (ML₁₊₄) of the uncured rubber compound wasdetermined at 130° C. by using an Alpha Technologies Mooney viscometerwith a large rotor, a one-minute warm-up time, and a four-minute runningtime. The tensile mechanical properties (modulus, T_(b), and E_(b)) ofthe vulcanizates were measured by using the standard procedure describedin ASTM-D412. The hysteresis data (tan δ) and the Payne effect data(ΔG′) of the vulcanizates were obtained from a dynamic strain-sweepexperiment, which was conducted at 50° C. and 15 Hz with strain sweepingfrom 0.1% to 20%. ΔG′ is the difference between G′ at 0.1% strain and G′at 20% strain. The physical properties of the vulcanizates aresummarized in Table 3. In FIG. 1, the tan δ data are plotted against thecompound Mooney viscosities.

TABLE 3 Physical Properties of Rubber Vulcanizates Prepared fromcis-1,4- Polybutadiene Example No. Example 7 Example 8 Example 9 Example10 Example 11 Example 12 Polymer used Example 2 Example 3 Example 4Example 5 Example 6 Example 7 Polymer type unmodified unmodified 2- 2-2- 2- cyanopyridine cyanopyridine cyanopyridine Cyanopyridine andMe₃SiCl and Me₂SiCl₂ and MeSiCl₃ and SiCl₄ modified modified modifiedmodified Compound 45.4 66.7 51.3 47.9 48.2 48.6 ML₁₊₄ at 130° C. 300%modulus 8.11 8.57 8.76 8.59 8.52 8.38 at 23° C. (MPa) T_(b) at 23° C.13.4 13.9 13.3 14.2 14.6 13.9 (MPa) E_(b) at 23° C. 419 412 396 420 431421 (%) tanδ at 50° C., 0.131 0.105 0.109 0.103 0.111 0.109 3% strainΔG′(MPa) 2.19 1.92 1.54 1.64 1.51 1.58

As can be seen in Table 3 and FIG. 1, at the same compound Mooneyviscosity or slightly higher, the cis-1,4-polybutadiene sample modifiedwith various chlorosilanes gives lower tan δ than the unmodifiedpolymer, indicating that the modification of cis-1,4-polybutadienereduces hysteresis. At the same or similar compound Mooney viscosity,the cis-1,4-polybutadiene sample modified with activated2-cyanopyridines also gives lower ΔG′ than the unmodified polymer,indicating that the Payne Effect has been reduced due to the strongerinteraction between the modified polymer and carbon black.

Various modifications and alterations that do not depart from the scopeand spirit of this invention will become apparent to those skilled inthe art. This invention is not to be duly limited to the illustrativeembodiments set forth herein.

What is claimed is:
 1. A method for preparing a functionalized polymer,the method comprising the steps of: (i) preparing a halosilane-activatednitrogen heterocycle containing a functional group by reacting ahalosilane with a nitrogen heterocycle containing a pendant functionalgroup, where the nitrogen heterocycle containing a pendant functionalgroup includes a nitrogen-containing heterocyclic group with a lone pairof electrons on a nitrogen atom within the ring of the heterocyclicgroup; (ii) preparing a reactive polymer; and (iii) reacting thereactive polymer with the halosilane-activated nitrogen heterocyclecontaining a functional group.
 2. The method of claim 1, where thenitrogen heterocycle containing a pendant functional group is defined byformula I:

where R⁷ is a trivalent group and Z is a substituent that will react orinteract with a reinforcing filler or react with a reactive polymer. 3.The method of claim 2, where the nitrogen heterocycle containing apendant functional group is defined by formula II:

where R⁷ is a trivalent group.
 4. The method of claim 2, where thenitrogen heterocycle containing a pendant functional group is defined byformula III:

where R³ is a monovalent organic group, R⁴ is a hydrogen atom or amonovalent organic group, and R⁷ is a trivalent group.
 5. The method ofclaim 2, where the nitrogen heterocycle containing a pendant functionalgroup is defined by formula IV:

where R⁵ is a hydrogen atom or a monovalent organic group, R⁶ is amonovalent organic group, and R⁷ is a trivalent group.
 6. The method ofclaim 2, where the nitrogen heterocycle containing a pendant functionalgroup is defined by formula V:

where R⁸ and R⁹ are each independently a monovalent organic group or ahydrolyzable group or where R⁸ and R⁹ join to form a divalent organicgroup, and R⁷ is a trivalent group.
 7. The method of claim 1, where thehalosilane is defined by the following formulaR_((4-n))SiX_(n) where each X is individually a halogen atom, each R isindividually a monovalent organic group, and n is an integer from 1 to4.
 8. The method of claim 1, where the halosilane is selected from thegroup consisting of tetrahalosilane, hydrocarbyltrihalosilane,dihydrocarbyldihalosilane, trihydrocarbylhalosilane,hydrocarbyloxytrihalosilane, dihydrocarbyloxydihalosilane,trihydrocarbyloxyhalosilane, hydrocarbylhydrocarbyloxydihalosilane,dihydrocarbylhydrocarbyloxyhalosilane, andhydrocarbyldihydrocarbyloxyhalosilane.
 9. The method of claim 1, wherethe monomer includes conjugated diene monomer.
 10. The method of claim9, where said step of polymerizing employs a coordination catalyst. 11.The method of claim 10, where the coordination catalyst is alanthanide-based catalyst.
 12. The method of claim 11, where thelanthanide-based catalyst includes (a) a lanthanide-containing compound,(b) an alkylating agent, and (c) a halogen source.
 13. The method ofclaim 12, where the alkylating agent includes an aluminoxane and anorganoaluminum compound represented by the formula AlR_(n)X_(3-n), whereeach R, which may be the same or different, is a monovalent organicgroup that is attached to the aluminum atom via a carbon atom, whereeach X, which may be the same or different, is a hydrogen atom, ahalogen atom, a carboxylate group, an alkoxide group, or an aryloxidegroup, and where n is an integer of 1 to
 3. 14. The method of claim 11,where said step of polymerizing monomer takes place within apolymerization mixture including less than 20% by weight of organicsolvent.
 15. The method of claim 10, where said step of polymerizingemploys an anionic initiator.
 16. The method of claim 15, where theanionic initiator is an organolithium compound.
 17. A method forpreparing a functional polymer, the method comprising the steps of: (i)preparing a halosilane-activated nitrogen heterocycle containing apendant functional group by reacting a halosilane with a nitrogenheterocycle containing a pendant functional group; (ii) providing anactive polymerization mixture containing a reactive polymer bypolymerizing conjugated diene monomer with an anionic initiator orpolymerizing conjugated diene monomer in the presence of a coordinationcatalyst system; and (iii) introducing the halosilane-activated nitrogenheterocycle containing a pendant functional group to the activepolymerization mixture without purifying the halosilane-activatednitrogen heterocycle containing a pendant functional group.
 18. Afunctionalized polymer prepared by the steps of: (i) preparing ahalosilane-activated nitrogen heterocycle containing a functional groupby reacting a halosilane with a nitrogen heterocycle containing apendant functional group, where the nitrogen heterocycle containing apendant functional group includes a nitrogen-containing heterocyclicgroup with a lone pair of electrons on a nitrogen atom within the ringof the heterocyclic group; (ii) preparing a reactive polymer; and (iii)reacting the reactive polymer with the halosilane-activated nitrogenheterocycle containing a functional group.
 19. A tire component preparedby employing the functionalized polymer of claim
 18. 20. A vulcanizablecomposition comprising: the functionalized polymer of claim 18, afiller, and a curative.